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 277
ating metal wheel carrying the metal projections a. Asthe projections approach the ends b of the circuit, theyget near enough for the spark to pass. The rotation ofthe wheel carries the projections past b and graduallymake the gap longer, so that it soon becomes too long tocarry the oscillations.… … the gap is said to be synchronized. If no provision ismade to obtain this, the gap is called a nonsynchronousgap. In practical operation the appearance and sound ofthe spark gap when the spark is passing tells much aboutthe operation of the set. Spark gaps are usually adjust-able. The spark should…
Radio
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