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miércoles, 12 de octubre de 2016

Alexander Graham Bell
(Edinburgh, United Kingdom, 1847-Beinn Bhreagh, Canada, 1922) Scientific American speech therapist and Scottish origin, inventor of the telephone. Born into a family dedicated to the speech and pronunciation correction, Bell was educated with his brothers in the family professional tradition. He studied at the Royal High School of Edinburgh, and attended some classes at the University of Edinburgh and University College London, but his training was basically self-taught.
Alexander Graham Bell
In 1864 he held a residency at the Weston House Academy in Elgin, where he developed his studies on sound; in 1868 he worked as an assistant to his father in London, taking up his post following the departure of it to America. The sudden death of his elder brother because of tuberculosis, a disease that had also ended the life of his younger brother, negative impact on both health and mood of Bell.In these circumstances, in 1870 he moved to a village near Brantford (Canada) with the rest of his family, where his condition soon began to improve. A year later he moved to Boston, where he directed its activity to publicize the deaf learning system devised by his father, as reflected in the work Visible Speech (1866). The spectacular results of their work soon earned him a well-deserved reputation, getting offers to give several lectures, and in 1873 he was appointed professor of Vocal Physiology at Boston University.
  

At this time, with the enthusiastic collaboration of young mechanic Thomas Watson and sponsorship of parents of George Sanders and Mabel Hubbard (who would end up marrying the year 1877), two deaf students who had been taught by Bell, designed an apparatus for interconvert sound into electrical impulses. The invention, called the phone, was entered in the register of US patents in 1876. 
At first, the telephone got all kinds of ironic comments, but revealed as a communication medium to long distance feasible provoked controversial litigation patent marketing. In 1880, he received the Volta Prize. The money earned this award was invested in the development of a new project, the graphophone, in collaboration with Charles Sumner Tainter, one of the first recording systems known sounds. After his death in 1922, he left a legacy eighteen patents to his name and with his collaborators twelve.

Alexander Graham Bell

Alexander Graham Bell
(Edinburgh, United Kingdom, 1847-Beinn Bhreagh, Canada, 1922) Scientific American speech therapist and Scottish origin, inventor of the telephone. Born into a family dedicated to the speech and pronunciation correction, Bell was educated with his brothers in the family professional tradition. He studied at the Royal High School of Edinburgh, and attended some classes at the University of Edinburgh and University College London, but his training was basically self-taught.
Alexander Graham Bell
In 1864 he held a residency at the Weston House Academy in Elgin, where he developed his studies on sound; in 1868 he worked as an assistant to his father in London, taking up his post following the departure of it to America. The sudden death of his elder brother because of tuberculosis, a disease that had also ended the life of his younger brother, negative impact on both health and mood of Bell.In these circumstances, in 1870 he moved to a village near Brantford (Canada) with the rest of his family, where his condition soon began to improve. A year later he moved to Boston, where he directed its activity to publicize the deaf learning system devised by his father, as reflected in the work Visible Speech (1866). The spectacular results of their work soon earned him a well-deserved reputation, getting offers to give several lectures, and in 1873 he was appointed professor of Vocal Physiology at Boston University.
  

At this time, with the enthusiastic collaboration of young mechanic Thomas Watson and sponsorship of parents of George Sanders and Mabel Hubbard (who would end up marrying the year 1877), two deaf students who had been taught by Bell, designed an apparatus for interconvert sound into electrical impulses. The invention, called the phone, was entered in the register of US patents in 1876. 
At first, the telephone got all kinds of ironic comments, but revealed as a communication medium to long distance feasible provoked controversial litigation patent marketing. In 1880, he received the Volta Prize. The money earned this award was invested in the development of a new project, the graphophone, in collaboration with Charles Sumner Tainter, one of the first recording systems known sounds. After his death in 1922, he left a legacy eighteen patents to his name and with his collaborators twelve.

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lunes, 10 de octubre de 2016

You knew who invented the iPad
 We begin a new series of articles on inventions, these technological advances arising from the innovative spirit of the brightest minds on the planet, and that are aimed to make our lives easier. This time we will focus on emerging discoveries, inventions that have emerged during the early twenty-first century and that augurs a future full of new possibilities.
 iPad
 We have already spoken on this blog of Steve Jobs, one of the most innovative figures in our recent history, and several of the milestones that marked his work in technological progress. We had just left one in the pipeline: the iPad, an Apple device that, when I saw the light on 27 January 2010, returned to revolutionize the technology landscape.

    
Did you know that ... Apple had to pay 60 million dollars to the Taiwanese company Proview Technology Shenzhen because it had registered the name "iPad" in 2001?When the iPad hit the market, another recent invention took its place in the homes of half the world: the netbook, laptops small size that became popular after 2007. But Jobs tablet was much more comfortable to use, much lighter and had unique applications.
IPad impact was such that in 2013 companies Asus and Acer, the main producers of netbooks, announced their decision to stop manufacturing these devices; In addition, the invention of Jobs meant the opening of the market for tablets and the starting signal for other companies to launch similar devices to produce massively. The figures again elevate Jobs: only two years after the presentation of its tablet, Apple had already sold 84 million iPads worldwide.

You knew who invented the iPad

You knew who invented the iPad
 We begin a new series of articles on inventions, these technological advances arising from the innovative spirit of the brightest minds on the planet, and that are aimed to make our lives easier. This time we will focus on emerging discoveries, inventions that have emerged during the early twenty-first century and that augurs a future full of new possibilities.
 iPad
 We have already spoken on this blog of Steve Jobs, one of the most innovative figures in our recent history, and several of the milestones that marked his work in technological progress. We had just left one in the pipeline: the iPad, an Apple device that, when I saw the light on 27 January 2010, returned to revolutionize the technology landscape.

    
Did you know that ... Apple had to pay 60 million dollars to the Taiwanese company Proview Technology Shenzhen because it had registered the name "iPad" in 2001?When the iPad hit the market, another recent invention took its place in the homes of half the world: the netbook, laptops small size that became popular after 2007. But Jobs tablet was much more comfortable to use, much lighter and had unique applications.
IPad impact was such that in 2013 companies Asus and Acer, the main producers of netbooks, announced their decision to stop manufacturing these devices; In addition, the invention of Jobs meant the opening of the market for tablets and the starting signal for other companies to launch similar devices to produce massively. The figures again elevate Jobs: only two years after the presentation of its tablet, Apple had already sold 84 million iPads worldwide.

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Thomas Edison
Thomas Alva Edison was born on February 11, 1847, in Milan, a small town in Ohio where his father had settled, Samuel Edison, six years earlier. His father had to leave hastily Canada as a result of a rebellion against the English in which he took part and ended in failure. Marginalized by the railroad, activity in Milan was gradually decreasing, and the crisis affected the Edison family, who had to move back to a more prosperous place when his son Thomas had already reached the age of seven years.The new home was Port Huron in Michigan, where the future inventor first attended school. That was one very brief experience: it lasted only three months, after which he was expelled from the classroom, claiming his teacher absolute lack of interest and clumsiness but obvious, behaviors these that was not alien partial deafness He contracted in the aftermath of an attack of scarlet fever. His mother, Nancy Elliot, who had worked as a teacher before marrying, assumed hereinafter the education of young baby of the family, a task that played with no little talent, as it managed to inspire in him that boundless curiosity that would feature the highlight of his career throughout his life
Thomas Alva Edison
Within the ten years the small Thomas set up his first laboratory in the basement of his parents' house and taught himself the rudiments of chemistry and electricity. But at twelve, Edison also realized that he could exploit not only their creativity but also his keen practical sense. So, without forgetting his passion for experiments, he found that was in his hand to win cash money materializing some of their good occurrences.
His first initiative was selling newspapers and candy on the train that made the trip from Port Huron to Detroit. He had broken the Civil War and the travelers were hungry for news. Edison convinced the telegraph of the railroad to expose bulletin boards in the stations brief headlines about the development of the struggle, not to mention add foot full details appeared in newspapers; those newspapers sold Edison himself on the train and it goes without saying that detracted from the hands.
At the same time, constantly he is buying scientific journals, books and appliances, and came to convert the baggage car of the convoy in a new laboratory. He learned to telegraphing and after getting low price and used a printing press, began publishing a newspaper on your own, the Weekly Herald. One night, while he was working on his experiments, some phosphorus spilled caused a fire in the car. The train driver and the conductor managed to put out the fire and then thrown through the windows useful printing, bottles and pots thousand thronging the van. All the laboratory and even the inventor himself went to the track. Thus ended the first business of Thomas Alva Edison.
The young Edison was only sixteen when he decided to leave home to their parents. The population living found it too small. Not lacking initiative, he launched in search of new horizons. Luckily, perfectly mastered the telegraph office, and civil war had left many vacancies, so that was where it was, it would be easy to find work.
During the next five years Edison led a wandering life, from town to town, with occasional jobs. He was staying in squalid pensions and invested everything he earned on the purchase of books and equipment to experience, totally disregarding their personal appearance. Michigan to Ohio, then to Indianapolis, then Cincinnati, Memphis and a few months later, having gone through Tennessee.
His next job was in Boston, as a telegrapher on the night shift. He arrived there in 1868, and shortly after his twenty years could be the work of British scientist Michael Faraday Experimental Researches in Electricity, whose reading influenced him positively. Until then, there was only deserved reputation for having some magical gift that allowed him to easily fix any faulty device. Now, Faraday gave him the method to channel all his inventive genius. He became more orderly and disciplined, and has since acquired the habit of carry a notebook, always ready to jot down any idea or fact which claim his attention.
Convinced that his career goal was the invention, Edison left the job occupied and decided to become independent inventor, recording its first patent in 1868. It was an electric meter of votes that gave the Congress, but members of the chamber they described the apparatus superfluous. American inventor never forgot this lesson: an invention, above all, it should be necessary.
Edison in 1878
Without real in his pocket, Edison arrived in New York in 1869. A friend provided shelter in the basement of the Gold Indicator Co., transmitted by telegraph office to subscribers quotations Nymex. Soon after his arrival, the transmitting device malfunctioned, causing no small stir, and he volunteered to fix it, to accomplish this with amazing ease. In return, he was entrusted with the technical maintenance of all services of the company.
But was not interested in sedentary jobs, he took the first opportunity that presented itself to work again on their own. Very soon he received a commission from the Western Union, the largest telegraph company then. It urged him to build an effective printer listed securities traded. His response to this challenge was his first great invention: the Edison Universal Stock Printer. He was offered $ 40,000 by the apparatus, an amount that allowed him to finally settle down. He married in 1871 with Mary Stilwell, with whom he had two sons and a daughter, and installed a small shop but well equipped in Newark, New York, where he continued to experiment in the telegraph for new improvements and applications. His greatest contribution in this field was the quadruple system, allowing transmit four telegraph messages simultaneously by the same line, two in one direction and two in another.
Menlo Park laboratory
Soon Edison was raised to build a true research center, a 'factory inventions "as he called it, with laboratory, library, workshops and housing for him and his collaborators, in order to perform no matter what research, while they are practical, whether by commission or by pure self-interest. Economic resources did not lack and proportions of his projects demanded. He looked for a quiet outside New York until he found a farm inhabited in the village of Menlo Park place. It was the place chosen to build its new headquarters, the first research laboratory in the world, where would go inventions that would change the habits of much of the planet's inhabitants.
He settled there in 1876 (then twenty-eight), and immediately set to work. The search for a satisfactory telephone transmitter claimed his attention. Invented by Alexander G. Bell, although theoretically well conceived, he generated a current so weak that no use for general applications. He knew that the graphite particles, as maintained more or less tight, influenced on the electrical resistance, and applied this property to create a device that amplified considerably softer sounds: the carbon granules microphone, which he patented in 1876.
  Edison with his dictaphone, one of theapplications derived Phonograph
Edison was usual for a job to take him to another, and the previous case was no exception. While trying to perfect the telephone Bell noted a fact that hastened to describe in his notebook: "I just made an experience with a diaphragm having a blunt tip resting on wax paper that moves quickly. The vibrations of the human voice are printed cleanly, and no one that I can pick up and play any audible sound automatically when I get to work on it "doubt. Freed therefore the phone, it was time to deal with the matter. A cylinder, a diaphragm, a needle and other useful minor enough to build it in less than a year the phonograph, the most original of his inventions, a device that gathered under one principle recording and sound reproduction.
Edison himself was surprised by the simplicity of his invention, but soon forgot about it and went on to address the problem of electric lighting, the solution seemed more interesting. "I will provide light so cheap 'said Edison in 1879 that not only the rich can ignite your spark plugs." The answer was in the filament lamp. It was known that certain materials could become incandescent when a private air balloon they applied electric current. It only remained to find the right filament. That is, a metallic conductor that could be heated to incandescence without melting, keeping in this state as long as possible.
Before Edison, many other researchers worked in this direction, but when he did not haggle joined effort. He worked with filaments of the different species: platinum, which dismissed expensive, coal, soot and other materials, and even sent its employees to Japan, South America and Sumatra to collect different varieties of vegetable fibers before choosing the material who judged more convenient. The first of his lamps was ready on 21 October 1879. It was a light bulb carbonized bamboo filament, which exceeded forty hours of uninterrupted operation. The news of fact made plummet shares of gas lighting companies.
 With the invention gave celebrity (c. 1918)
In subsequent years, Edison took on improving his light bulb, and it was this activity that led him to the one of his discoveries belonging to a strictly scientific area. It happened in 1883, while trying to figure out why your blackened filament lamp using. In the course of such investigations, the prolific inventor witnessed the manifestation of a curious phenomenon: the lamp emitted a bluish glow when it was subject to certain conditions and vacuum was applied certain voltages. Edison found that such light emission was caused by the inexplicable presence of an electric current is established between the two rods that held the lamp filament, and used this phenomenon, which received its name, to design an electric meter whose patent registered in 1886.
In fact, Edison could have given here the passage of electrical engineering to electronics. He did not know, however gauge the importance of the discovery Her method, closest to the "trial and error" that scientific deduction, prevented it. We had to wait for the British engineer John A. Fleming, a technologist of solid scientific training, took the step in 1897 when he managed, after discrete changes, transform the electric meter Edison in the vacuum valve, the first of a long series electrical devices that gave rise to a new technological era.
More than a thousand inventions
In 1886, two years after the death of his wife, Edison married Mina Miller, woman of strong character, the daughter of a wealthy industrialist of Akran, Ohio, whose influence on her eccentric husband noted, as it managed to make it more sociable a person. The couple had three children, one of whom, Charles, was devoted to politics, eventually becoming governor of New Jersey.
Year marriage, Edison moved his laboratory in Menlo Park, a small seasoning, West Orange, New Jersey. He created a great technology center there, the Edison Laboratory (now a national monument), around which raised numerous workshops, which employed more than five thousand people.
 One of the workshops of West Orange
The electricity continued to absorb most of the time because it dealt with all aspects of production and distribution. Not lucky, however, as he made a serious mistake by insisting on the current system when compelling reasons exist for alternating current. Edison was also interested in many other industrial sectors: cement production and chemical materials, electromagnetic separation of iron and manufacture of batteries and accumulators for cars were some of your favorite.
His last great invention was the Kinetograph, patent registered in 1891. It was a rudimentary camera film that included, however, an ingenious mechanism to ensure the intermittent movement of the film. In 1894 Edison Kinetoscope Parlor opened on Broadway, New York, where a single spectator sat in front of a peephole in a wooden cabin to see the film, which was lit from behind by an electric lamp. Although the Kinetoscope Parlor immediately aroused attention as fairground attraction, Edison never believed it was important to find a projection system for older audiences, which prevented him from giving the final the cinematograph of the Lumière brothers step.
 The Kinetoscope Parlor

The activity of this great inventor went beyond the eighty years of age, completing the list of technological achievements to total the 1,093 patents that came to register in life. Atherosclerosis, however, he was undermining the health of this restless old, whose death occurred on October 18, 1931, in West Orange, New Jersey.

Thomas Edison

Thomas Edison
Thomas Alva Edison was born on February 11, 1847, in Milan, a small town in Ohio where his father had settled, Samuel Edison, six years earlier. His father had to leave hastily Canada as a result of a rebellion against the English in which he took part and ended in failure. Marginalized by the railroad, activity in Milan was gradually decreasing, and the crisis affected the Edison family, who had to move back to a more prosperous place when his son Thomas had already reached the age of seven years.The new home was Port Huron in Michigan, where the future inventor first attended school. That was one very brief experience: it lasted only three months, after which he was expelled from the classroom, claiming his teacher absolute lack of interest and clumsiness but obvious, behaviors these that was not alien partial deafness He contracted in the aftermath of an attack of scarlet fever. His mother, Nancy Elliot, who had worked as a teacher before marrying, assumed hereinafter the education of young baby of the family, a task that played with no little talent, as it managed to inspire in him that boundless curiosity that would feature the highlight of his career throughout his life
Thomas Alva Edison
Within the ten years the small Thomas set up his first laboratory in the basement of his parents' house and taught himself the rudiments of chemistry and electricity. But at twelve, Edison also realized that he could exploit not only their creativity but also his keen practical sense. So, without forgetting his passion for experiments, he found that was in his hand to win cash money materializing some of their good occurrences.
His first initiative was selling newspapers and candy on the train that made the trip from Port Huron to Detroit. He had broken the Civil War and the travelers were hungry for news. Edison convinced the telegraph of the railroad to expose bulletin boards in the stations brief headlines about the development of the struggle, not to mention add foot full details appeared in newspapers; those newspapers sold Edison himself on the train and it goes without saying that detracted from the hands.
At the same time, constantly he is buying scientific journals, books and appliances, and came to convert the baggage car of the convoy in a new laboratory. He learned to telegraphing and after getting low price and used a printing press, began publishing a newspaper on your own, the Weekly Herald. One night, while he was working on his experiments, some phosphorus spilled caused a fire in the car. The train driver and the conductor managed to put out the fire and then thrown through the windows useful printing, bottles and pots thousand thronging the van. All the laboratory and even the inventor himself went to the track. Thus ended the first business of Thomas Alva Edison.
The young Edison was only sixteen when he decided to leave home to their parents. The population living found it too small. Not lacking initiative, he launched in search of new horizons. Luckily, perfectly mastered the telegraph office, and civil war had left many vacancies, so that was where it was, it would be easy to find work.
During the next five years Edison led a wandering life, from town to town, with occasional jobs. He was staying in squalid pensions and invested everything he earned on the purchase of books and equipment to experience, totally disregarding their personal appearance. Michigan to Ohio, then to Indianapolis, then Cincinnati, Memphis and a few months later, having gone through Tennessee.
His next job was in Boston, as a telegrapher on the night shift. He arrived there in 1868, and shortly after his twenty years could be the work of British scientist Michael Faraday Experimental Researches in Electricity, whose reading influenced him positively. Until then, there was only deserved reputation for having some magical gift that allowed him to easily fix any faulty device. Now, Faraday gave him the method to channel all his inventive genius. He became more orderly and disciplined, and has since acquired the habit of carry a notebook, always ready to jot down any idea or fact which claim his attention.
Convinced that his career goal was the invention, Edison left the job occupied and decided to become independent inventor, recording its first patent in 1868. It was an electric meter of votes that gave the Congress, but members of the chamber they described the apparatus superfluous. American inventor never forgot this lesson: an invention, above all, it should be necessary.
Edison in 1878
Without real in his pocket, Edison arrived in New York in 1869. A friend provided shelter in the basement of the Gold Indicator Co., transmitted by telegraph office to subscribers quotations Nymex. Soon after his arrival, the transmitting device malfunctioned, causing no small stir, and he volunteered to fix it, to accomplish this with amazing ease. In return, he was entrusted with the technical maintenance of all services of the company.
But was not interested in sedentary jobs, he took the first opportunity that presented itself to work again on their own. Very soon he received a commission from the Western Union, the largest telegraph company then. It urged him to build an effective printer listed securities traded. His response to this challenge was his first great invention: the Edison Universal Stock Printer. He was offered $ 40,000 by the apparatus, an amount that allowed him to finally settle down. He married in 1871 with Mary Stilwell, with whom he had two sons and a daughter, and installed a small shop but well equipped in Newark, New York, where he continued to experiment in the telegraph for new improvements and applications. His greatest contribution in this field was the quadruple system, allowing transmit four telegraph messages simultaneously by the same line, two in one direction and two in another.
Menlo Park laboratory
Soon Edison was raised to build a true research center, a 'factory inventions "as he called it, with laboratory, library, workshops and housing for him and his collaborators, in order to perform no matter what research, while they are practical, whether by commission or by pure self-interest. Economic resources did not lack and proportions of his projects demanded. He looked for a quiet outside New York until he found a farm inhabited in the village of Menlo Park place. It was the place chosen to build its new headquarters, the first research laboratory in the world, where would go inventions that would change the habits of much of the planet's inhabitants.
He settled there in 1876 (then twenty-eight), and immediately set to work. The search for a satisfactory telephone transmitter claimed his attention. Invented by Alexander G. Bell, although theoretically well conceived, he generated a current so weak that no use for general applications. He knew that the graphite particles, as maintained more or less tight, influenced on the electrical resistance, and applied this property to create a device that amplified considerably softer sounds: the carbon granules microphone, which he patented in 1876.
  Edison with his dictaphone, one of theapplications derived Phonograph
Edison was usual for a job to take him to another, and the previous case was no exception. While trying to perfect the telephone Bell noted a fact that hastened to describe in his notebook: "I just made an experience with a diaphragm having a blunt tip resting on wax paper that moves quickly. The vibrations of the human voice are printed cleanly, and no one that I can pick up and play any audible sound automatically when I get to work on it "doubt. Freed therefore the phone, it was time to deal with the matter. A cylinder, a diaphragm, a needle and other useful minor enough to build it in less than a year the phonograph, the most original of his inventions, a device that gathered under one principle recording and sound reproduction.
Edison himself was surprised by the simplicity of his invention, but soon forgot about it and went on to address the problem of electric lighting, the solution seemed more interesting. "I will provide light so cheap 'said Edison in 1879 that not only the rich can ignite your spark plugs." The answer was in the filament lamp. It was known that certain materials could become incandescent when a private air balloon they applied electric current. It only remained to find the right filament. That is, a metallic conductor that could be heated to incandescence without melting, keeping in this state as long as possible.
Before Edison, many other researchers worked in this direction, but when he did not haggle joined effort. He worked with filaments of the different species: platinum, which dismissed expensive, coal, soot and other materials, and even sent its employees to Japan, South America and Sumatra to collect different varieties of vegetable fibers before choosing the material who judged more convenient. The first of his lamps was ready on 21 October 1879. It was a light bulb carbonized bamboo filament, which exceeded forty hours of uninterrupted operation. The news of fact made plummet shares of gas lighting companies.
 With the invention gave celebrity (c. 1918)
In subsequent years, Edison took on improving his light bulb, and it was this activity that led him to the one of his discoveries belonging to a strictly scientific area. It happened in 1883, while trying to figure out why your blackened filament lamp using. In the course of such investigations, the prolific inventor witnessed the manifestation of a curious phenomenon: the lamp emitted a bluish glow when it was subject to certain conditions and vacuum was applied certain voltages. Edison found that such light emission was caused by the inexplicable presence of an electric current is established between the two rods that held the lamp filament, and used this phenomenon, which received its name, to design an electric meter whose patent registered in 1886.
In fact, Edison could have given here the passage of electrical engineering to electronics. He did not know, however gauge the importance of the discovery Her method, closest to the "trial and error" that scientific deduction, prevented it. We had to wait for the British engineer John A. Fleming, a technologist of solid scientific training, took the step in 1897 when he managed, after discrete changes, transform the electric meter Edison in the vacuum valve, the first of a long series electrical devices that gave rise to a new technological era.
More than a thousand inventions
In 1886, two years after the death of his wife, Edison married Mina Miller, woman of strong character, the daughter of a wealthy industrialist of Akran, Ohio, whose influence on her eccentric husband noted, as it managed to make it more sociable a person. The couple had three children, one of whom, Charles, was devoted to politics, eventually becoming governor of New Jersey.
Year marriage, Edison moved his laboratory in Menlo Park, a small seasoning, West Orange, New Jersey. He created a great technology center there, the Edison Laboratory (now a national monument), around which raised numerous workshops, which employed more than five thousand people.
 One of the workshops of West Orange
The electricity continued to absorb most of the time because it dealt with all aspects of production and distribution. Not lucky, however, as he made a serious mistake by insisting on the current system when compelling reasons exist for alternating current. Edison was also interested in many other industrial sectors: cement production and chemical materials, electromagnetic separation of iron and manufacture of batteries and accumulators for cars were some of your favorite.
His last great invention was the Kinetograph, patent registered in 1891. It was a rudimentary camera film that included, however, an ingenious mechanism to ensure the intermittent movement of the film. In 1894 Edison Kinetoscope Parlor opened on Broadway, New York, where a single spectator sat in front of a peephole in a wooden cabin to see the film, which was lit from behind by an electric lamp. Although the Kinetoscope Parlor immediately aroused attention as fairground attraction, Edison never believed it was important to find a projection system for older audiences, which prevented him from giving the final the cinematograph of the Lumière brothers step.
 The Kinetoscope Parlor

The activity of this great inventor went beyond the eighty years of age, completing the list of technological achievements to total the 1,093 patents that came to register in life. Atherosclerosis, however, he was undermining the health of this restless old, whose death occurred on October 18, 1931, in West Orange, New Jersey.

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George Washington Carver
 (Diamond, 1864 - Tuskegee, 1943) Agronomist and American botanist known for its innovations in the field of agriculture. Son of slaves, was released at the end of the civil war and settled in Kansas, where he studied and graduated.
George Washington Carver
In 1894, he continued his studies at the Faculty of Agriculture of the state of Iowa and in 1896 served as director of the Department of Agriculture of the Tuskegee Institute, where numerous applied to the improvement and use of botanical species that could be alternated with farming work conducted cotton regions of the southern United States; such species were peanuts (also called groundnuts), sweet potato and soybean; species with which performed numerous experiments and which won numerous industrial uses.
Peanut came to extract more than 300 products, many foodstuffs such as oil, flour and cheese, and many other industrial, such as dyes, soaps and plastics. Sweetpotato extracted some 100 products, such as adhesives and synthetic rubber, and soybean oil and land obtained paintings with which he painted several highly recognized and prized paintings. In addition to providing alternative products for growing cotton, he also developed a new type, called hybrid cotton Carver, and provided techniques and methods for better land use.
His work was recognized and came to consult even US presidents. In 1935 he worked in the Division of Disease Mycology and Inspection Office of Industrial Plants of the Ministry of Agriculture of the United States, and later research center Wanhington George Carver was created in Tuskegee.

George Washington Carver

George Washington Carver
 (Diamond, 1864 - Tuskegee, 1943) Agronomist and American botanist known for its innovations in the field of agriculture. Son of slaves, was released at the end of the civil war and settled in Kansas, where he studied and graduated.
George Washington Carver
In 1894, he continued his studies at the Faculty of Agriculture of the state of Iowa and in 1896 served as director of the Department of Agriculture of the Tuskegee Institute, where numerous applied to the improvement and use of botanical species that could be alternated with farming work conducted cotton regions of the southern United States; such species were peanuts (also called groundnuts), sweet potato and soybean; species with which performed numerous experiments and which won numerous industrial uses.
Peanut came to extract more than 300 products, many foodstuffs such as oil, flour and cheese, and many other industrial, such as dyes, soaps and plastics. Sweetpotato extracted some 100 products, such as adhesives and synthetic rubber, and soybean oil and land obtained paintings with which he painted several highly recognized and prized paintings. In addition to providing alternative products for growing cotton, he also developed a new type, called hybrid cotton Carver, and provided techniques and methods for better land use.
His work was recognized and came to consult even US presidents. In 1935 he worked in the Division of Disease Mycology and Inspection Office of Industrial Plants of the Ministry of Agriculture of the United States, and later research center Wanhington George Carver was created in Tuskegee.

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Leonardo da Vinci
Considered the paradigm of homo universalis, the Renaissance scholar versed in all areas of human knowledge, Leonardo da Vinci (1452-1519) dabbled in such varied fields as aerodynamics, hydraulics, anatomy, botany, painting, sculpture and architecture, among many. His scientific research was, to a large extent, forgotten and little appreciated by his contemporaries; his painting, however, was immediately recognized as a master able to realize the ideal of beauty in works of disturbing suggestion and delicate poetry.
 Recreation of a portrait of Leonardo
On an artistic level, Leonardo forms, along with Michelangelo and Raphael, the triad of the great masters of the Cinquecento, and despite the paucity of his work, the history of painting it counts among its greatest geniuses. For others, it is possible that the powerful fascination aroused his masterpieces (with La Gioconda at the top) appropriate that other fascination about her figure that has continued to grow over the centuries, fueled by the many enigmas surrounding his biography, some of them trivial, such as right-to-left, and others certainly disturbing, like those visionary inventions five centuries ahead of their time.
Youth and technical discoveries
Leonardo was born in 1452 in the Tuscan town of Vinci, the illegitimate son of a peasant woman, Caterina (who married soon after with a craftsman in the region), and Ser Piero, a wealthy Florentine notary. Italy was then a mosaic of city-states such as Florence, Venice and small republics like fiefdoms under the power of princes or the pope. The Eastern Roman Empire fell to the Turks in 1453 and barely survived still very small, the Holy Roman Empire; It was a violent time when, however, the splendor of the courts had no limits.
Although his father was married four times, had children (eleven in total, with which Leonardo would build lawsuits paternal inheritance) in his last two marriages, so the little Leonardo was raised as an only child only. His enormous curiosity manifested itself early: already in childhood drawing mythological animals of his own invention, inspired by a deep observation of the natural environment in which he grew up. Giorgio Vasari, his first biographer, tells how the genius of Leonardo, still a child, he created a shield of Medusa with dragons that terrorized his father when he ran into him by surprise.
Aware of his son's talent, his father allowed him to enter as an apprentice in the workshop of Andrea del Verrocchio. Over the six years that the painters' guild prescribed as instruction before being recognized as free artist, Leonardo learned painting, sculpture and mechanical techniques and artistic creation. The first work of his that has accurate news was the construction of the image projected by Brunelleschi to crown the church of Santa Maria dei Fiori copper sphere. Next to Verrocchio's workshop, moreover, it was that of Antonio Pollaiuolo, where Leonardo made his first studies of anatomy and perhaps also began in the knowledge of Latin and Greek.
Young graceful and vigorous, Leonardo had inherited the physical strength of the lineage of his father; It is very likely to be the model for the head of San Miguel in the box Verrocchio Tobias and the Angel, fine and beautiful features. Moreover, his great creative imagination and skill of his early brush soon surpass those of his teacher. In the Baptism of Christ, for example, inspired the angels painted by Leonardo contrast with the abruptness of the Baptist by Verrocchio.
 Angels attributed to Leonardo in the Baptism of Christ (c. 1475) by Andrea del Verrocchio
The young disciple there for the first time used a novel technique recently arrived from the Netherlands: oil painting, allowing greater softness in the stroke and deeper penetration into the fabric. In addition to the extraordinary drawings and virtuous participation in other paintings of his teacher, his great works of this period are a St. Jerome and the large panel Adoration of the Magi (both unfinished), notable for the innovative dynamism given by the skill in contrasts features in the geometric composition of the scene and the extraordinary handling of the technique of chiaroscuro.
Florence was then one of the richest cities in Europe; numerous weaving mills and workshops manufacturing of silks and brocades from east and west wool made it the great commercial center of the peninsula; there the Medicis had established a court whose splendor was not just the artists he had. But when the young Leonardo found that could not of Lorenzo the Magnificent but praise its virtues of good courtier, in his thirties he decided to seek a more prosperous horizon.
First Milanese period (1482-1499)
In 1482 he appeared before the powerful Ludovico Sforza, the strongman of Milan, in whose court would stay seventeen years as "pictor et ingenierius ducalis." Although his main occupation was military engineer, projects (mostly unrealized) included the hydraulic, mechanical (with innovative systems of levers to multiply human strength) and architecture, in addition to painting and sculpture. It was the period of full development; following the mathematical foundations established by Leon Battista Alberti and Piero della Francesca, Leonardo began his notes for the formulation of a science of painting, while exercised in the implementation and manufacture of lutes.
Spurred by the dramatic plague that struck Milan and Leonardo saw the cause overcrowding and dirt of the city, projected spacious villas, made plans for piping systems rivers and ingenious defense against the enemy artillery. Having received from Ludovico commissioned to create a monumental equestrian statue in honor of Francesco, the founder of the Sforza dynasty, Leonardo worked for sixteen years on the project of the "great horse" that would not happen more than a clay model, destroyed during a battle shortly after.
It proved especially fruitful friendship with the mathematician Luca Pacioli, a Franciscan friar who around 1496 concluded his treatise divine proportion, illustrated by Leonardo. Pondering the instrument seen as the most accurate knowledge available to man, Leonardo said that through careful observation objects should be recognized in its form and structure to describe in paint the most accurate way. Thus the drawing became the fundamental instrument of his teaching method, to the point that it could be said that in his notes the text was to explain the drawing, and not vice versa, reason why Leonardo da Vinci has been recognized as the creator of modern scientific illustration.
The ideal vedere saper guided all his studies, which in the 1490s began to emerge as a series of unfinished treaties which would then be compiled in the Codex Atlanticus, named for its large size. Includes work on painting, architecture, mechanics, anatomy, geography, botany, hydraulic and aerodynamic, fusing art and science in a single cosmology which also gives an outlet for an aesthetic debate that was anchored in a rather sterile neoplatonism .
Although Leonardo did not seem to worry too much about form their own school, in his Milanese workshop was created gradually a group of faithful apprentices and students: Giovanni Boltraffio, Ambrogio de Predis, Andrea Solari and his inseparable Salai, among others; scholars have not agreed yet on the exact attribution of some works of this period, such as Madonna Litta or the portrait of Lucrezia Crivelli.

Detail of Virgin of the Rocks (second version, c. 1507)
Recruited in 1483 by the brotherhood of the Immaculate Conception for a painting for the church of San Francisco, Leonardo undertook the realization of what would be the Virgin very famous of the Rocks, the end result, in two versions, would not be ready at eight month she is marking the contract, but twenty years later. In both versions the triangular structure of the composition, the grace of the figures and the brilliant use of the famous sfumato to enhance the visionary sense of the scene assumed an aesthetic revolution for his contemporaries.
To this same period belong the portrait of Ginevra de Benci (1475-1478), with its innovative relationship of proximity and distance, and the expressive beauty of La belle Ferronnière. But by 1498 Leonardo ended a mural in principle a modest commission for the refectory of the Dominican convent of Santa Maria dalle Grazie, which would become his definitive consecration painting: The Last Supper. Today we need an effort to understand its original splendor as it deteriorated rapidly and was badly restored many times. The great plastic capturing the dramatic moment when Christ tells the apostles "one of you I will betray" gives the scene a psychological unity and a dynamic apprehension of the fleeting moment of surprise diners (of which only Judas is excluded). The mural became not only a celebrated Christian icon, but also an object of pilgrimage for artists from around the continent.
The return to Florence
In late 1499 the French entered Milan; Ludovico il Moro lost power. Leonardo left the city accompanied by Pacioli and after a brief stay in Mantua, at his admirer Isabella d'Este Marchioness arrived in Venice. Harassed by the Turks, who already dominated the Dalmatian coast and threatened to take the Friuli, the Signoria of Venice Leonardo hired as a military engineer.
Within weeks he designed a number of artifacts whose concrete realization would only, in many cases, until the nineteenth or twentieth centuries: a few soldiers armed with from a kind of individual submarine with a leather tube for air intended drill, they would attack the boats under to large pieces of artillery projectiles delayed action and vessels with double wall to resist the onslaught. The exorbitant costs, lack of time and perhaps the claims of Leonardo in the division of spoils, excessive for Venetians made the great ideas not happen sketches. In April 1500, after nearly twenty years of absence, Leonardo da Vinci returned to Florence.
then he dominated the city Cesare Borgia, son of Pope Alexander VI. Described by Machiavelli himself as "incomparable model" of political and despot schemer, this ambitious man and feared he was preparing to embark on the conquest of new territories. Leonardo, again as a military engineer, toured the northern territories, drawing maps, calculating precise distance and projecting bridges and new artillery guns. But soon after the condottiero fell into disgrace: his captains mutinied, his father was poisoned and he fell seriously ill. In 1503 Leonardo returned to Florence, who was then at war with Pisa, and conceived there his great project to divert the River Arno behind the enemy city to fence it also contemplating the construction of a canal and waterway communicate Florence with the sea. The project was completed only in extraordinary maps of their author.
Santa Ana, the Virgin and Child (c. 1510)
But Leonardo was already recognized as one of the greatest masters of Italy. In 1501 he had drawn a sketch of his Santa Ana, the Virgin and Child, which would move the canvas at the end of the decade. In 1503 he was commissioned to paint a large mural (twice the size of The Last Supper) in Old Palace: the Florentine nobility wanted to immortalize some historical scenes of his glory. Leonardo spent three years at The Battle of Anghiari, which would be incomplete and would then be detached by deterioration. Despite the loss, sketches and copies circulated to admire and inspire Rafael, a century later, a famous play Peter Paul Rubens.
Also it survived only in copies another great work of this period: Leda and the Swan. However, the summit of this Florentine stage (and one of the few finished works by Leonardo) was the portrait of Mona (short for Madonna) Lisa Gherardini, wife of Francesco del Giocondo, why the box is known as La Mona Lisa or La Gioconda. famous from the time of its creation, work became model portrait and almost no one would escape its influence in the world of painting. As picture and as a character, the mythical Gioconda has inspired countless books and legends, and even an opera; but little is known for certain. You not even know who commissioned the painting, which Leonardo would carry on his continued vital pilgrimage until his last years in France, where he sold it to King Francis I of four thousand pieces of gold.
 Detail of the Mona Lisa (c. 1503-1507)
Perfecting his own discovery of the sfumato, leading to an almost miraculous concreteness, Leonardo managed to capture a gesture between the fleeting and the perennial: the "enigmatic smile" of the Mona Lisa is one of the most admired, discussed and imitated chapters of art history , and mystery still continues to fascinate. There is a legend that Leonardo promoted this gesture in his model making lutes sound as she rested; the painting, which has gone through quite a few ups and downs, has been considered summit and summary of talent and "pictorial science" of its author.
Back in Milan (1506-1513)
Leonardo's interest in science education was increasingly intense. Attended dissections, on which confeccionaba drawings to describe the structure and functioning of the human body; at the same time made systematic observations of the flight of birds (on which he planned to write a treaty), with the conviction that also the man could fly if he ever know the laws of air resistance (some notes from this period have been seen as clear precursors of the modern helicopter).
Absorbed by these thoughts and concerns, Leonardo did not hesitate to leave Florence in 1506 when Charles d'Amboise, the French governor of Milan, offered him the position of architect and painter of the court; honored and admired by his new employer, Leonardo da Vinci project for a castle and executed sketches for the oratory of Santa Maria dalla Fontana, founded by the patron. His Milanese stay only was interrupted in the winter of 1507, when he worked in Florence with the sculptor Giovanni Francesco Rustici in the execution of the bronzes of the baptistery of the city.
Perhaps too old-looking for the fifty years that had then, his face was taken by Rafael as a model of sublime Plato for his work The School of Athens. Leonardo, however, painted little, devoting himself to collect his writings and deepen their studies with the idea of ​​having completed by 1510 his treatise on anatomy, worked with Marcantonio della Torre, the most famous anatomist of his time, in the description organ and the study of human physiology.
 
Leonardo as Plato in The School of Athens (1511), Rafael
The leonardesco ideal of "cosmological perception" manifested itself in many branches: wrote on mathematics, optics, mechanics, geology, botany; your search tended toward finding laws, functions and compatible harmonies for all these disciplines to nature as a unit. Meanwhile, his former disciples joined some new, including the young nobleman Francesco Melzi, a faithful friend of the teacher until his death. Along with Ambrogio de Predis, Leonardo culminated around 1507 the second version of Virgin of the Rocks; shortly before, he had left unfulfilled commissioned by the king of France to paint two Madonnas.
The new strongman of Milan was then Gian Giacomo Trivulzio, who sought to reappropriate for himself the monumental project of the "great horse", making it a funerary statue for his own tomb in the chapel of San Nazaro Magiore; but again the equestrian monument moved from the sketches, which led to Leonardo his second frustration as a sculptor. In 1513 a new political instability pushed to leave Milan; Melzi and Salai along he went to Rome, where he was housed in the belvedere of Giuliano de Medici, brother of the new Pope Leo X.
Last years Rome and France
In the Vatican he enjoyed a period of tranquility, with a living wage and without major obligations: drew maps, studied ancient Roman monuments, designed a residence for the Medici family in Florence and also resumed his close friendship with the great architect Donato Bramante, until the latter's death in 1514. But in 1516, he died his protector Giuliano de Medici, Leonardo left Italy definitively to spend the last three years of his life in the palace of Cloux as "first painter, architect and mechanic of the king".
The great respect that I made dispensed Francisco Leonardo pass this last stage of his life rather as a member of the nobility as an employee of the royal household. Fatigued and concentrated on writing his last pages for never completed Treatise on Painting, cultivated more theory than practice, but still extraordinary drawings executed on biblical and apocalyptic themes. He managed to complete the ambiguous San Juan Bautista, an androgynous elf overflowing grace, sensuality and mystery; in fact, his disciples would imitate shortly after making it a pagan Baco, which today can be seen in the Louvre in Paris.
  Detail of San Juan Bautista (c. 1516)
From 1517 his health, hitherto unshakable, began to worsen. His right arm was paralyzed; but, with his tireless left hand, Leonardo still made sketches of urban projects, of rivers and drains to the palatial decorations for parties. Converted into a museum, home of Amboise was filled with papers and notes containing ideas of this remarkable man, many of which would have to wait centuries to demonstrate its feasibility and even its necessity; he even, at this time, to conceive the idea of ​​prefabricated houses. Just for the three fabrics chosen to accompany him on his last leg (San Juan Bautista, La Gioconda and Santa Ana, the Virgin and Child) then it can be said that Leonardo had one of the great treasures of his time.
On May 2, 1519 died in Cloux; Melzi his will he bequeathed to his books, manuscripts and drawings, the disciple took care of returning to Italy. As often happens with great geniuses, they have been woven around his death some legends; one of them, inspired by Vasari claims that Leonardo, regretted not having brought a society governed by the laws of the Church existence, pleaded long and, with his last strength, joined the bier to receive, before expiring, the sacraments.

Leonardo da Vinci

Leonardo da Vinci
Considered the paradigm of homo universalis, the Renaissance scholar versed in all areas of human knowledge, Leonardo da Vinci (1452-1519) dabbled in such varied fields as aerodynamics, hydraulics, anatomy, botany, painting, sculpture and architecture, among many. His scientific research was, to a large extent, forgotten and little appreciated by his contemporaries; his painting, however, was immediately recognized as a master able to realize the ideal of beauty in works of disturbing suggestion and delicate poetry.
 Recreation of a portrait of Leonardo
On an artistic level, Leonardo forms, along with Michelangelo and Raphael, the triad of the great masters of the Cinquecento, and despite the paucity of his work, the history of painting it counts among its greatest geniuses. For others, it is possible that the powerful fascination aroused his masterpieces (with La Gioconda at the top) appropriate that other fascination about her figure that has continued to grow over the centuries, fueled by the many enigmas surrounding his biography, some of them trivial, such as right-to-left, and others certainly disturbing, like those visionary inventions five centuries ahead of their time.
Youth and technical discoveries
Leonardo was born in 1452 in the Tuscan town of Vinci, the illegitimate son of a peasant woman, Caterina (who married soon after with a craftsman in the region), and Ser Piero, a wealthy Florentine notary. Italy was then a mosaic of city-states such as Florence, Venice and small republics like fiefdoms under the power of princes or the pope. The Eastern Roman Empire fell to the Turks in 1453 and barely survived still very small, the Holy Roman Empire; It was a violent time when, however, the splendor of the courts had no limits.
Although his father was married four times, had children (eleven in total, with which Leonardo would build lawsuits paternal inheritance) in his last two marriages, so the little Leonardo was raised as an only child only. His enormous curiosity manifested itself early: already in childhood drawing mythological animals of his own invention, inspired by a deep observation of the natural environment in which he grew up. Giorgio Vasari, his first biographer, tells how the genius of Leonardo, still a child, he created a shield of Medusa with dragons that terrorized his father when he ran into him by surprise.
Aware of his son's talent, his father allowed him to enter as an apprentice in the workshop of Andrea del Verrocchio. Over the six years that the painters' guild prescribed as instruction before being recognized as free artist, Leonardo learned painting, sculpture and mechanical techniques and artistic creation. The first work of his that has accurate news was the construction of the image projected by Brunelleschi to crown the church of Santa Maria dei Fiori copper sphere. Next to Verrocchio's workshop, moreover, it was that of Antonio Pollaiuolo, where Leonardo made his first studies of anatomy and perhaps also began in the knowledge of Latin and Greek.
Young graceful and vigorous, Leonardo had inherited the physical strength of the lineage of his father; It is very likely to be the model for the head of San Miguel in the box Verrocchio Tobias and the Angel, fine and beautiful features. Moreover, his great creative imagination and skill of his early brush soon surpass those of his teacher. In the Baptism of Christ, for example, inspired the angels painted by Leonardo contrast with the abruptness of the Baptist by Verrocchio.
 Angels attributed to Leonardo in the Baptism of Christ (c. 1475) by Andrea del Verrocchio
The young disciple there for the first time used a novel technique recently arrived from the Netherlands: oil painting, allowing greater softness in the stroke and deeper penetration into the fabric. In addition to the extraordinary drawings and virtuous participation in other paintings of his teacher, his great works of this period are a St. Jerome and the large panel Adoration of the Magi (both unfinished), notable for the innovative dynamism given by the skill in contrasts features in the geometric composition of the scene and the extraordinary handling of the technique of chiaroscuro.
Florence was then one of the richest cities in Europe; numerous weaving mills and workshops manufacturing of silks and brocades from east and west wool made it the great commercial center of the peninsula; there the Medicis had established a court whose splendor was not just the artists he had. But when the young Leonardo found that could not of Lorenzo the Magnificent but praise its virtues of good courtier, in his thirties he decided to seek a more prosperous horizon.
First Milanese period (1482-1499)
In 1482 he appeared before the powerful Ludovico Sforza, the strongman of Milan, in whose court would stay seventeen years as "pictor et ingenierius ducalis." Although his main occupation was military engineer, projects (mostly unrealized) included the hydraulic, mechanical (with innovative systems of levers to multiply human strength) and architecture, in addition to painting and sculpture. It was the period of full development; following the mathematical foundations established by Leon Battista Alberti and Piero della Francesca, Leonardo began his notes for the formulation of a science of painting, while exercised in the implementation and manufacture of lutes.
Spurred by the dramatic plague that struck Milan and Leonardo saw the cause overcrowding and dirt of the city, projected spacious villas, made plans for piping systems rivers and ingenious defense against the enemy artillery. Having received from Ludovico commissioned to create a monumental equestrian statue in honor of Francesco, the founder of the Sforza dynasty, Leonardo worked for sixteen years on the project of the "great horse" that would not happen more than a clay model, destroyed during a battle shortly after.
It proved especially fruitful friendship with the mathematician Luca Pacioli, a Franciscan friar who around 1496 concluded his treatise divine proportion, illustrated by Leonardo. Pondering the instrument seen as the most accurate knowledge available to man, Leonardo said that through careful observation objects should be recognized in its form and structure to describe in paint the most accurate way. Thus the drawing became the fundamental instrument of his teaching method, to the point that it could be said that in his notes the text was to explain the drawing, and not vice versa, reason why Leonardo da Vinci has been recognized as the creator of modern scientific illustration.
The ideal vedere saper guided all his studies, which in the 1490s began to emerge as a series of unfinished treaties which would then be compiled in the Codex Atlanticus, named for its large size. Includes work on painting, architecture, mechanics, anatomy, geography, botany, hydraulic and aerodynamic, fusing art and science in a single cosmology which also gives an outlet for an aesthetic debate that was anchored in a rather sterile neoplatonism .
Although Leonardo did not seem to worry too much about form their own school, in his Milanese workshop was created gradually a group of faithful apprentices and students: Giovanni Boltraffio, Ambrogio de Predis, Andrea Solari and his inseparable Salai, among others; scholars have not agreed yet on the exact attribution of some works of this period, such as Madonna Litta or the portrait of Lucrezia Crivelli.

Detail of Virgin of the Rocks (second version, c. 1507)
Recruited in 1483 by the brotherhood of the Immaculate Conception for a painting for the church of San Francisco, Leonardo undertook the realization of what would be the Virgin very famous of the Rocks, the end result, in two versions, would not be ready at eight month she is marking the contract, but twenty years later. In both versions the triangular structure of the composition, the grace of the figures and the brilliant use of the famous sfumato to enhance the visionary sense of the scene assumed an aesthetic revolution for his contemporaries.
To this same period belong the portrait of Ginevra de Benci (1475-1478), with its innovative relationship of proximity and distance, and the expressive beauty of La belle Ferronnière. But by 1498 Leonardo ended a mural in principle a modest commission for the refectory of the Dominican convent of Santa Maria dalle Grazie, which would become his definitive consecration painting: The Last Supper. Today we need an effort to understand its original splendor as it deteriorated rapidly and was badly restored many times. The great plastic capturing the dramatic moment when Christ tells the apostles "one of you I will betray" gives the scene a psychological unity and a dynamic apprehension of the fleeting moment of surprise diners (of which only Judas is excluded). The mural became not only a celebrated Christian icon, but also an object of pilgrimage for artists from around the continent.
The return to Florence
In late 1499 the French entered Milan; Ludovico il Moro lost power. Leonardo left the city accompanied by Pacioli and after a brief stay in Mantua, at his admirer Isabella d'Este Marchioness arrived in Venice. Harassed by the Turks, who already dominated the Dalmatian coast and threatened to take the Friuli, the Signoria of Venice Leonardo hired as a military engineer.
Within weeks he designed a number of artifacts whose concrete realization would only, in many cases, until the nineteenth or twentieth centuries: a few soldiers armed with from a kind of individual submarine with a leather tube for air intended drill, they would attack the boats under to large pieces of artillery projectiles delayed action and vessels with double wall to resist the onslaught. The exorbitant costs, lack of time and perhaps the claims of Leonardo in the division of spoils, excessive for Venetians made the great ideas not happen sketches. In April 1500, after nearly twenty years of absence, Leonardo da Vinci returned to Florence.
then he dominated the city Cesare Borgia, son of Pope Alexander VI. Described by Machiavelli himself as "incomparable model" of political and despot schemer, this ambitious man and feared he was preparing to embark on the conquest of new territories. Leonardo, again as a military engineer, toured the northern territories, drawing maps, calculating precise distance and projecting bridges and new artillery guns. But soon after the condottiero fell into disgrace: his captains mutinied, his father was poisoned and he fell seriously ill. In 1503 Leonardo returned to Florence, who was then at war with Pisa, and conceived there his great project to divert the River Arno behind the enemy city to fence it also contemplating the construction of a canal and waterway communicate Florence with the sea. The project was completed only in extraordinary maps of their author.
Santa Ana, the Virgin and Child (c. 1510)
But Leonardo was already recognized as one of the greatest masters of Italy. In 1501 he had drawn a sketch of his Santa Ana, the Virgin and Child, which would move the canvas at the end of the decade. In 1503 he was commissioned to paint a large mural (twice the size of The Last Supper) in Old Palace: the Florentine nobility wanted to immortalize some historical scenes of his glory. Leonardo spent three years at The Battle of Anghiari, which would be incomplete and would then be detached by deterioration. Despite the loss, sketches and copies circulated to admire and inspire Rafael, a century later, a famous play Peter Paul Rubens.
Also it survived only in copies another great work of this period: Leda and the Swan. However, the summit of this Florentine stage (and one of the few finished works by Leonardo) was the portrait of Mona (short for Madonna) Lisa Gherardini, wife of Francesco del Giocondo, why the box is known as La Mona Lisa or La Gioconda. famous from the time of its creation, work became model portrait and almost no one would escape its influence in the world of painting. As picture and as a character, the mythical Gioconda has inspired countless books and legends, and even an opera; but little is known for certain. You not even know who commissioned the painting, which Leonardo would carry on his continued vital pilgrimage until his last years in France, where he sold it to King Francis I of four thousand pieces of gold.
 Detail of the Mona Lisa (c. 1503-1507)
Perfecting his own discovery of the sfumato, leading to an almost miraculous concreteness, Leonardo managed to capture a gesture between the fleeting and the perennial: the "enigmatic smile" of the Mona Lisa is one of the most admired, discussed and imitated chapters of art history , and mystery still continues to fascinate. There is a legend that Leonardo promoted this gesture in his model making lutes sound as she rested; the painting, which has gone through quite a few ups and downs, has been considered summit and summary of talent and "pictorial science" of its author.
Back in Milan (1506-1513)
Leonardo's interest in science education was increasingly intense. Attended dissections, on which confeccionaba drawings to describe the structure and functioning of the human body; at the same time made systematic observations of the flight of birds (on which he planned to write a treaty), with the conviction that also the man could fly if he ever know the laws of air resistance (some notes from this period have been seen as clear precursors of the modern helicopter).
Absorbed by these thoughts and concerns, Leonardo did not hesitate to leave Florence in 1506 when Charles d'Amboise, the French governor of Milan, offered him the position of architect and painter of the court; honored and admired by his new employer, Leonardo da Vinci project for a castle and executed sketches for the oratory of Santa Maria dalla Fontana, founded by the patron. His Milanese stay only was interrupted in the winter of 1507, when he worked in Florence with the sculptor Giovanni Francesco Rustici in the execution of the bronzes of the baptistery of the city.
Perhaps too old-looking for the fifty years that had then, his face was taken by Rafael as a model of sublime Plato for his work The School of Athens. Leonardo, however, painted little, devoting himself to collect his writings and deepen their studies with the idea of ​​having completed by 1510 his treatise on anatomy, worked with Marcantonio della Torre, the most famous anatomist of his time, in the description organ and the study of human physiology.
 
Leonardo as Plato in The School of Athens (1511), Rafael
The leonardesco ideal of "cosmological perception" manifested itself in many branches: wrote on mathematics, optics, mechanics, geology, botany; your search tended toward finding laws, functions and compatible harmonies for all these disciplines to nature as a unit. Meanwhile, his former disciples joined some new, including the young nobleman Francesco Melzi, a faithful friend of the teacher until his death. Along with Ambrogio de Predis, Leonardo culminated around 1507 the second version of Virgin of the Rocks; shortly before, he had left unfulfilled commissioned by the king of France to paint two Madonnas.
The new strongman of Milan was then Gian Giacomo Trivulzio, who sought to reappropriate for himself the monumental project of the "great horse", making it a funerary statue for his own tomb in the chapel of San Nazaro Magiore; but again the equestrian monument moved from the sketches, which led to Leonardo his second frustration as a sculptor. In 1513 a new political instability pushed to leave Milan; Melzi and Salai along he went to Rome, where he was housed in the belvedere of Giuliano de Medici, brother of the new Pope Leo X.
Last years Rome and France
In the Vatican he enjoyed a period of tranquility, with a living wage and without major obligations: drew maps, studied ancient Roman monuments, designed a residence for the Medici family in Florence and also resumed his close friendship with the great architect Donato Bramante, until the latter's death in 1514. But in 1516, he died his protector Giuliano de Medici, Leonardo left Italy definitively to spend the last three years of his life in the palace of Cloux as "first painter, architect and mechanic of the king".
The great respect that I made dispensed Francisco Leonardo pass this last stage of his life rather as a member of the nobility as an employee of the royal household. Fatigued and concentrated on writing his last pages for never completed Treatise on Painting, cultivated more theory than practice, but still extraordinary drawings executed on biblical and apocalyptic themes. He managed to complete the ambiguous San Juan Bautista, an androgynous elf overflowing grace, sensuality and mystery; in fact, his disciples would imitate shortly after making it a pagan Baco, which today can be seen in the Louvre in Paris.
  Detail of San Juan Bautista (c. 1516)
From 1517 his health, hitherto unshakable, began to worsen. His right arm was paralyzed; but, with his tireless left hand, Leonardo still made sketches of urban projects, of rivers and drains to the palatial decorations for parties. Converted into a museum, home of Amboise was filled with papers and notes containing ideas of this remarkable man, many of which would have to wait centuries to demonstrate its feasibility and even its necessity; he even, at this time, to conceive the idea of ​​prefabricated houses. Just for the three fabrics chosen to accompany him on his last leg (San Juan Bautista, La Gioconda and Santa Ana, the Virgin and Child) then it can be said that Leonardo had one of the great treasures of his time.
On May 2, 1519 died in Cloux; Melzi his will he bequeathed to his books, manuscripts and drawings, the disciple took care of returning to Italy. As often happens with great geniuses, they have been woven around his death some legends; one of them, inspired by Vasari claims that Leonardo, regretted not having brought a society governed by the laws of the Church existence, pleaded long and, with his last strength, joined the bier to receive, before expiring, the sacraments.

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