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 266
d on cd. As thewheel revolves, the magnetic circuit is changed as theprojections, p, and the slots, s, come between b and c.The projections, p, being iron, allow a strong magneticflux (field) to pass, the slots, s, being air or a nonmag-netic metal, permit only a weak magnetic flux to pass.This… … it can be turned at a high rate of speed without danger offlying apart. By use of this style of generator, Alexan-derson has produced a machine which gives a frequencyof 100,000 cycles per second. There are 300 slots in theinductor (wheel, W) which turns at a speed of 20,000revolutions per minute.…
Radio
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
