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
75
expand a fine wire, causing the needle to move over a
graduated scale and indicate the amount of current pass-
ing. The apparatus is “tuned” or in resonance when the
Fig. 9I>—Loose coupled tuning coil.
length of the spark gap, the condenser and the helix have
been so adjusted that the oscillations flow freely through
the system and the maximum amount of current is in-
dicated by the ammeter.
Fig. 92.—Loose coupled tuner.
The loose coupled tuning coil consists of two windings
wound over two concentric cylinders, forming a primary
and a secondary. The secondary is the smaller winding
and slides in and out of the primary so that the “coupling