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Edison's serious incandescent light bulb research began in 1878, filling his first patent later that year.."Improvement in electric light bulbs.
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The first light bulb was made.
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In November 1879, Edison filed a patent for an electric lamp with a carbon filament.
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Edison and his team of researchers in Edison's laboratory in Melgn park, NJ, tested more than 3,000 designs for bulbs between 1878 and 1880
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His experiments involved the fabrication and testing of many different metal filaments, including platinum.
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Edison successful tested a filament that burned 13.5 hours.
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Edison then resorted to a carbon based, high resistance, filaments.
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By new years he was demonstrating lamps using carbonized cardboard filaments and there were to large crowds at the Menlo park laboratory.
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Edison and his team discovered that a carbonized bamboo filament could last over 1200 hours.
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Edison worked on many improvements to his signature invention, an invention that literally changed the way we lived after dark.
