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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WIRELESS TELEGRAPHY
127
The reason is very simple and readily explained. For
the sake of clearness we will suppose that the speed of the
interrupter attached to the coil is 100 per second. It will
therefore produce 100 sparks per second at the spark gap
if the electrodes are close together. The passage of the
Fig. 141.—Wireless telephone receiving apparatus (induction
method).
sparks is not continuous, each one only occupying a very
small space of time. The pause between each is very dis-
tinct, although it could not be detected with the naked eye.
The ten straight lines in Fig. 141 represent ten sparks
which cover a period of one-tenth of a second, since they
pass at the rate of 100 per second. Each spark produces a
train of oscillations, which surge back and forth in the
aerial, rapidly dying out, however, or becoming damped
in the manner already explained.