![]() ![]() ![]() He connected the foil to the lamp filament through a galvanometer. 1883 Edison built a bulb with the inside surface covered with metal foil.1879 The electric filament bulb is invented simultaneously by Thomas Alva Edison in the United States and Sir Joseph Wilson Swan in England.1878 Sir William Crookes invented the ‘Crookes tube’, an early prototype of cathode-ray tube. ![]() This wave could propagate through space (a vacuum) at the speed of light.
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