Vol. 20: Humphry Davy and the Arc Light

More than 70 years before Edison’s 1879 incandescent lamp patent, the English scientist Humphry Davy developed a technique for producing controlled light from electricity.

By William Gurstelle

Photos by William Gurstelle, National Portrait Gallery, London, Ed Troxell

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Vol. 20: Humphry Davy and the Arc Light

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