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
125
of sparks at the gap, is connected to the aerial and ground
in the usual manner and a telephone transmitter placed in
series with the ground wire. When the coil is set in opera-
tion the sparks jump across the gap, each spark setting up
a train of oscillations. If speech is conveyed into the
AERIAL
BATTERY
I G I
GROUND
Fig. 139.—A “logical” form of wireless telephone which is
impracticable.
transmitter, the resistance in the path of the oscillations
will be varied and correspondingly also the strength of
the waves emitted. The sounds will be reproduced to a
certain extent by the receptor. Whistling, certain musical
tones, and words containing many vowels are sometimes
heard in the receptor, with sufficient distinctness to be
recognizable. The voice cannot, however, be heard at all
times, and the system is of no real value other than an in-
teresting experiment.