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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32
WIRELESS TELEGRAPHY
a current possesses a magnetic field which will induce a
current of electricity in another neighboring coil.
SPARK GAP
-O O-
^JECONOARY
BATTERY
Fig. 34.—Diagram of induction coil.
The induction coil consists essentially of a primary
winding of heavy wire wound around a soft iron core
and surrounded by a secondary coil consisting of many
thousand turns of fine wire, carefully insulated. The cur-
rent from a battery is sent through the primary coil and
sets up a magnetic field. The magnetic field induces a
Fig. 35.—Induction coil for wireless telegraph purposes.
current in the secondary whose voltage is approximately
proportional to the ratio of the turns of the secondary
to the primary. Thus, if the secondary contains one hun-