Wireless Telegraphy and Telephony
Forfatter: Alfred P. Morgan
År: 1917
Forlag: The Norman W. Henley Publishing Company
Sted: New York
Udgave: Third Edition, Fully Illustrated
Sider: 33
UDK: 621.396.1 Mor
A practical Treatise on Wireless Telegraphy and Telephony, giving Complete and Detailed Explanations of the Theory and Practice of Modern Radio Apparatus and its Present Day Applications, together with a chapter on the possibilities of its Future Development
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54
WIRELESS TELEGRAPHY
the little magnet coils contained in the telephone receivers
exert a choking action upon alternating currents of high
frequency which effectually blocks their passage. Low
frequency alternating currents, intermittent direct currents
A
Fig. 66.—Illustrating the valve action of a rectifying detector.
and continuous direct currents will readily pass, producing
a sound—each time there is any change in their value.
The purpose and action of most types of detectors is to act
as a valve allowing the current to pass through in one
Fig. 67.—A new type of silicon detector in which a crystal of
arsenic may be brought to bear against the surface of one of
several silicon crystals.