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2. Edison light bulb - Wikipedia

   en.wikipedia.org/wiki/Edison_light_bulb

   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 ...

3. Incandescent light bulb - Wikipedia

   en.wikipedia.org/wiki/Incandescent_light_bulb

   Comparison of Edison, Maxim, and Swan bulbs, 1885 Edison carbon filament lamps, early 1880s Thomas Alva Edison. Thomas Edison began serious research into developing a practical incandescent lamp in 1878. Edison filed his first patent application for "Improvement in Electric Lights" on 14 October 1878. [40]

4. Longest-lasting light bulbs - Wikipedia

   en.wikipedia.org/wiki/Longest-lasting_light_bulbs

   Thomas Edison designed a bulb that was supposed to last forever, called the Eternal Light, and turned it on on October 22, 1929. The bulb is located in the Edison Memorial Tower at the Thomas Edison Center at Menlo Park, a small museum near the tower in Menlo Park, New Jersey. The tower fell down in 1937, but the bulb's power was supposedly ...

5. Centennial Light - Wikipedia

   en.wikipedia.org/wiki/Centennial_Light

   The bulb was made by hand, using a carbon filament (of greater thickness and strength than the tungsten filaments used in most modern lightbulbs) along with brass and glass components of high quality. The low wattage (originally 60 watts, now approximately four) and high nitrogen atmosphere inside the bulb have also contributed to its longevity.

6. Electric light - Wikipedia

   en.wikipedia.org/wiki/Electric_light

   Sign with instructions on the use of light bulbs A tablet at St John the Baptist Church, Hagley commemorates the installation of electric light in 1934. In its modern form, the incandescent light bulb consists of a coiled filament of tungsten sealed in a globular glass chamber, either a vacuum or full of an inert gas such as argon.

7. William Joseph Hammer - Wikipedia

   en.wikipedia.org/wiki/William_Joseph_Hammer

   The exclusion of air was essential to maximize the life of the filament. Edison had chosen a carbonized (burned) bamboo filament for his new lamp, but this solution was not perfect. After being heated to incandescence for a few hours, carbon from the filament would be deposited on the inside walls of the bulb, turning it black.