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Lewis Howard Latimer (September 4, 1848 – December 11, 1928) was an American inventor and patent draftsman. His inventions included an evaporative air conditioner, an improved process for manufacturing carbon filaments for electric light bulbs, and an improved toilet system for railroad cars.
Light bulbs with a carbon filament were first demonstrated by Thomas Edison in October 1879. [1] [2] These carbon filament bulbs, the first electric light bulbs, became available commercially that same year. [3] In 1904 a tungsten filament was invented by Austro-Hungarians Alexander Just and Franjo Hanaman, [4] and was more efficient and longer ...
Matthew Evans is one of two Canadians who developed and patented an incandescent light bulb, on July 24, 1874, five years before Thomas Alva Edison's U.S. patent on the device. Evans, from Toronto, Ontario, and his friend Henry Woodward, made the light bulb by sending electricity through a filament made of carbon. Evans was a hotelier.
At the time, Edison was attempting to produce a reliable and commercial electric light bulb. The essence of his idea was that a filament would glow within a glass envelope from which the air had been evacuated when electrically energized with direct current (DC). The exclusion of air was essential to maximize the life of the filament.
A photo of the original purchase order from Thomas Edison to Corning for the glass encasement for Edison’s lightbulb in 1880. CEO Wendell Weeks keeps the purchase order framed in his office as a ...
The carbon strip was in a hermetically sealed glass bulb that was filled with nitrogen gas. When electricity was applied, the internal strip developed a temperature of between 5,000 and 40,000 °F (22,200 °C). Since there was no oxygen in the glass globe the carbon filament did not burn out and produced light instead when it got hot. [21]
The carbon burner, a "most important feature of a practical lamp" differs widely from Edison's filament. Several earlier inventors working on the light bulb had progressed as far in their work as Woodward and Evans: Marcellin Jobard in 1838, C. de Changy in 1856, John Wellington Starr in 1845 and Joseph Swan in 1860. Each contributed to the ...
Edison showcased his victory in this famous trial at the 1893 World's Fair in Chicago. There, inside one of the many lamp cases on display at the Edison exhibit of the General Electric Company were displayed two of the "tar putty" carbon filament lamps made by John W. Howell for the 1890 trial, as well as the tools used by Howell to make said ...