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John Hopkinson
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Michael Faraday (L) English physicist and chemist (electromagnetism) and John Frederic Daniell (R) British chemist and meteorologist who invented the Daniell cell.
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Italian-born physicist Dr. Enrico Fermi draws a diagram at a blackboard with mathematical equations. circa 1950.
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John Hopkinson

British physicist
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John Hopkinson (born July 27, 1849, Manchester, Eng.—died Aug. 27, 1898, Mount Petite Dent de Veisivi, Switz.) was a British engineer and physicist who invented the three-wire system for electricity distribution and improved the design and efficiency of electric generators. In 1872, he became the engineering manager of Chance Brothers and Company, a glass manufacturer in Birmingham, where he studied the problems of lighthouse illumination and advocated the use of flashing groups of lights for...

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