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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20
WIRELESS TELEGRAPHY
lines marked A B, and appearing very much like a little
grating, represent an aerial of the inverted “L” type, look-
ing down on it from above. B is the free end of the aerial,
and A the closed end, or end to which the wires leading
Fig. 17.—A diagram illustrating the directive action of a
flat-top aerial.
down to the station are attached. If a snapshot of the lines
of strain produced in the ether as the waves move away
from the aerial could be taken, they would appear like the
curved lines in the illustration. It can be readily seen that
those passing outward from the aerial in a direction oppo-
site to that in which the free encl points are the strongest,
and that the radiation in that direction is the best.
Fig. 18.—Aerials of the “V” and inverted “L” types.