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 311
s seen that at a temperature of about1,800° (dull red glow) very little current flows. Thismeans that at that temperature very few electrons arethrown off by the filament. From that point up to a tem-perature of about 2,050 (white hot) there is a rapid in-crease in the rate of emitting electrons… … A 6 C PJate Voltage eor B
Radio
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