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 314
vac-uum tube. F, G, and P are all mounted in an inclosurefrom which most of the air has been pumped. The pipesare filled with flour—each particle of which represents anelectron. A is a blower which is just strong enough tokeep a fountain of flour, F in the diagram, in the spaceabove its opening. A… … through the pipe back to A. The pump B corresponds tothe battery B in figure 32; the funnel P corresponds tothe plate. It is evident that the stronger the suction at P,the more flour will be attracted. In the same way in thevacuum tube, the stronger the positive potential of theplate the more…
Radio
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