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Humphrey Davy
http://www.enchantedlearning.com/inventors/edison/lightbulb.shtml</a>In 1809 Humphrey Davy, a British chemist, began the idea of an incandescent light bulb.He simply used a high power battery to create a current between two charcoal strips creating an intence incandescent light.When he connected wires to his battery and a piece of carbon, the carbon glowed, producing light. This is called an electric arc -
Willis Whitnew
http://americanhistory.si.edu/lighting/bios/whitney.htmWillis R. Whitney introduced a 'fix' to the light bulb, so that the inside of the bulb would not darken as the filament began to glow, thus producing more vivid and bright light. By operating the filaments at higher temperatures than regular carbon filament, Whitney could obtain higher efficiency while continuing to use existing production equipment.the new lamps were marketed in 1904 as "general electric metallized "or gem" lamps. -
invention of the first incadescent light bulb
http://americanhistory.si.edu/lighting/bios/swan.htmin 1878 Joesph Wilson Swan created the incadescent lamp which was made of carbon fiber, which came from cotton.better pumps help improve is project so it could be successful. Swan used a carbon rod with low electrical resistance in his lamp. Due to the relationship between resistance and current, a low resistance element required lots of current in order to become hot and glow -
Thomas Edison's Invention of the Lightbulb
http://www.edisonmuckers.org/thomas-edison-lightbulb/In 1878, Thomas Edison improved the lightbulb, by creating one that lasted for 40 hours. To improve the lightbulb, Edison placed the filament in an "oxygenless bulb".Thomas Edison created a new lamp that used a carbon filament. -
Edison's Improvement of the Light Bulb
http://www.edisonmuckers.org/thomas-edison-lightbulb/Edison improved his invention of the light bulb, by creating a light bulb that lasted 1500 hours. To create this he used a bamboo derived filament.In 1879, Edison discovered that a carbon filament in an oxygen-free bulb glowed but did not burn up for 40 hours. Edison eventually produced a bulb that could glow for over 1500 hours. -
Willian D. Coolidge
http://www.inventionreaction.com/famous/Light-BulbThey required a complex mounting structure with several filaments placed in electrical series. Coolidge began investigating how he might improve tungsten lamps by making a bendable or "ductile" wire. William D. Coolidge developed a light bulb that consists of a fine tungsten powder pressed into bars.When these were heated at extreem heats it formed a wire filament.
