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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72 WIRELESS TELEGRAPHY
descend at the right moment to add its energy and motion
to that previously given the ball. The result will be con-
siderable increase in the amplitude of the swing.
From this we may easily perceive how it is possible by
shortening or lengthening the period of an electrical circuit
to so adjust it that resonance is secured and each succeeding
oscillation will take place at the proper time to assist the
Fig. 87.—Loose coupled helix.
previous one, not dying away after one or two surges and
becoming what is known in technical language as rapidly
“damped.”
The instruments for accomplishing these things consist
as previously explained, in the case of a transmitter, of the
helix and in the receiving station of various tuning coils
and condensers.
Helix and tuning coils are divided into the “inductive”
or loose and the "direct” or close coupled types. Induc-
tive tuning coils are known as “loose-couplers” and “re-
ceiving transformers.” Inductive helixes consist simply
of two helixes, separated from one another as shown in
the accompanying illustration. The upper helix, called the