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
73
secondary, can be raised or lowered upon a central support.
Varying the distance between the primary and secondary is
varying the “coupling.” There are several advantages
Fig. 88.—Hot-wire ammeter.
derived by using loose coupled sending helixes, the chief of
which lie in the fact that it is possible to radiate larger
amounts of energy and also decrease the “damping.”
Fig. 89.—The principle of the hot-wire ammeter.
In order to tune a transmitter, the “hot-wire” ammeter
is necessary. This instrument makes use of the property
which electrical conductors possess to become heated and
expand when a current is passed through them.