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
31
of cardboard and passing a wire carrying a current of
electricity through the hole. If iron filings are sprinkled
on the cardboard, they will arrange themselves in circles
Fig. 32.—Magnetic phantom formed by wire carrying current.
around the wires, forming a magnetic phantom and show-
ing that a coil of wire carrying- a current of electricity
generates a magnetic field in its vicinity. By forming
the wire into a coil the magnetic field generated is much
stronger, for the then combined effect of the wires is
secured.
I IG. 33. Magnetic phantom formed by coil of wire carrying current.
The induction coil and transformer are simply instru-
ments utilizing the principle that a coil of wire carrying