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
I3I
ally over 1,000,000), setting up persistent undamped oscil-
lations.
Perhaps a better conception of how it is possible for a
Fig. 145.—Arrangement of the speaking arc.
continuous current, such as that which supplies the arc, to
change into alternating current, vibrating backward and
forward, may be gained by comparison with the steady
forward motion of a violin bow, which produces a to and
fro motion of the strings.
Fig. 146.—Diagram showing how a wireless telephone transmitting
system is arranged.
It was later discovered by Poulsen that if one of the arc
electrodes was kept cool by making it of copper and passing
water through it that the efficiency was greatly increased.
A further improvement was obtained by burning the arc