Lec 5b The evolution of the light bulb

Lec 5b The evolution of the light bulb - Lighting...

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EXTRAORDINARY PHYSICAL PROPERTIES : Lighting
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EXTRAORDINARY PHYSICAL PROPERTIES : The Greek began making terra cotta lamps to replace handheld torches. The word “lamp” is derived from the Greek word lampas, meaning torch . 7 th century BC Ancient terra cotta lamps
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EXTRAORDINARY PHYSICAL PROPERTIES : Candles earliest known candles were made from whale fat by the Chinese, during the Quin Dynasty 200, made from wax from insects and seeds
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EXTRAORDINARY PHYSICAL PROPERTIES : Central burner was invented Fuel source tightly enclosed in metal with adjustable metal tube Plant oil/animal oil was used as fuel A petroleum derivative, kerosene, was used as fuel in late 19 th century 19 th century Kerosene Lamp
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EXTRAORDINARY PHYSICAL PROPERTIES : The 1st light bulb was built by Humphry Davy (an Englishman) in 1809. Sir Joseph Wilson Swan produced an early electric light bulb (1860), and in 1880, independently of Thomas Alva Edison, he produced a carbon-filament incandescent electric lamp.
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