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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44
WIRELESS TELEGRAPHY
mounted upon the shaft of an electric motor. Two other
adjustable electrodes are so mounted that the small elec-
Fig. 54.—Diagram of aerial switch.
trodes on the revolving member pass between. When the
motor is set in operation the wheel revolves at a high rate
Fig. 55.—Photo of aerial switch.
of speed interrupting the spark and causing a peculiar
musical pitch to be emitted. A rotary spark gap almost
entirely eliminates the arcing of the spark.