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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120 WIRELESS TELEGRAPHY
back of a mouthpiece, and arranged to reflect the rays of
the sun, or the light of an arc lamp.
The receiver was a small glass bulb containing a plate of
mica covered with lampblack, or little charred pieces of
Fig. 136.—Powerful searchlight arranged to transmit speech over a
beam of light.
cork. The glass bulb was placed in the focus of a reflector,
which collected the rays and concentrated them. The vari-
ations in the intensity of the heat radiations caused the air
in the bulb to expand or contract with each vibration. Rub-
ber tubes extended from the bulb to the ears of the ob-
server, and the pulsations of air, traveling through the