Radio, miracle of the 20th century ... a story of human achievement that stands unrivalled in the history of humanity, together with a colorful portrayal, giving a broad, general view of the whole subject of wireless telegraph and telephone and its marvelous development (1922)
Drinker, Frederick E. [from old catalog], Lewis, James G., [from old catalog] joint author · [Philadelphia, Printed by National publishing co.] · leaf 312
000 2100 82.00 FTtoment 7&mperotvr>e MIRACLE OF THE AGE 285 A current flows in the tube because the filament emitselectrons. The electrons pass from the filament to theplate and grid. Neither the plate nor grid can emit elec-trons as they are not heated. This means that the elec-trons can… … nected to the plate or not built in the tube) may be used asa detector in place of the galena crystal. Such a tube mayalso be used as a rectifier of alternating currents, becauseit allows current to pass only in one direction. The use ofthe grid greatly improves the action of the tube and willbe…
Radio
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