Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 495
er-nating current be substitutedfor the direct current source(battery 7>), the vacuum valvewould transmit current in onedirection only, half of eachcycle being held in check. If a screen of fine wire G,known as a grid, be introduced between the filament andthe plate of Fig. 40(5 (see Fig. 407)… … Fig. 467. A three-elcctrotle vacuumtube ELECTEICAL RADIATIONS 431
Physics
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