Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 494
-Plate -Filament-Grid—Filament … Fig. 465. A popular form of vacuum tube used in radio receiving that a current of electricity is a stream of negative elec-trons which, when passing through a vacuum, move withenormous velocity (thousands of miles per second (§ 498)),but when passing along a wire (ordinary conduction) movequite…
Physics
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