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#Crossword light bulb gas how to

Commercial development of an incandescent lamp was delayed until a filament could be made that would heat to incandescence without melting and until a satisfactory vacuum tube could be built. Frederick de Moleyns of England was granted the first patent for an incandescent lamp in 1841 he used powdered charcoal heated between two platinum wires. In 1801 the English chemist Sir Humphry Davy had demonstrated the incandescence of platinum strips heated in the open air by electricity, but the strips did not last long. More-practical lighting could be obtained from an incandescent lamp. If Thomas Edison didn't invent the lightbulb, who did? See all videos for this article

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#Crossword light bulb gas how to

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