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 39
Considerable care must be used in proportioning the
windings so that they possess sufficient reactance. Reac-
tance is the tendency of a coil to resist the flow of an
alternating current. A reactance coil is sometimes placed
Fig. 45.—Oil immersed condenser.
in circuit with an open core transformer to prevent the
spark from arcing. Arcing is the tendency of .the spark
to pass across the gap without charging the condenser and
creating any high frequency oscillations.
The condenser, it will be remembered is the means
of storing up the energy, which suddenly rushing across
the spark gap, produces the oscillations necessary to gen-
erate the electric waves. A battery of ley den jars may
be used as a transmitting condenser in connection with
small induction coils. Their objection in large stations