Profile
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ABOUT THOMAS EDISON
Who was a scientist, inventor & businessman
Developed many devices that greatly influenced life around the world, including the phonograph, the motion picture camera, and a long-lasting, practical electric light bulb.
He is credited with numerous inventions that contributed to mass communication and, in particular, telecommunications.
His advanced work in these fields was an outgrowth of his early career as a telegraph operator.
Edison originated the concept and implementation of electric-power generation and distribution to homes, businesses, and factories.
– a crucial development in the modern industrialized world.
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Credits: 1 2 3
Inventions
9:38 PM

-carbon telephone transmitter-
Carbon telephone transmitter
In 1877–1878, Edison invented and developed the carbon microphone used in all telephones along with the Bell receiver until the 1980s. After protracted patent litigation, in 1892 a federal court ruled that Edison—and not Emile Berliner—was the inventor of the carbon microphone. The carbon microphone was also used in radio broadcasting and public address work through the 1920s.
Electric light
After many experiments with platinum and other metal fila
ments, Edison returned to a carbon filament. The first successful test was on October 22, 1879; it lasted 40 hours. Edison continued to improve this design and by November 4, 1879, filed for U.S. patent 223,898 (granted on January 27, 1880) for an electric lamp using "a carbon filament or strip coiled and connected to platina contact wires".
Edison allegedly bought light bulb U.S. patent 181,613 of Henry Woodward that was issued August 29, 1876, and obtained an exclusive license to Woodward's Canadian patent. These patents covered a carbon rod in a nitrogen filled glass cylinder, and differed substantially from the first commercially practical bulb invented by Edison.
In 1878, Edison formed the Edison Electric Light Company in New York City with several financiers, including J. P. Morgan and the members of the Vanderbilt family. Edison made the first public demonstration of his incandescent light bulb on December 31, 1879, in Menlo Park. It was during this time that he said: "We will make electricity so cheap that only the rich will burn candles."