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 129
3^ g.0) o 31 5 s Pi o £ o r £§ O o£ N 0) O c£ v ■ si d t_ <t-l +-> S m rt N O … MIRACLE OF THE AGE 113 north and south poles alternately. The half needles maybe broken again into equal or unequal portions and thisprocess continued, the result being the same each time.The poles of every short piece of the needle appearweaker than the original poles. This is due chiefly be-cause…
Radio
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
