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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62
WIRELESS TELEGRAPHY
being necessary to send any very energetic ones. By ar-
ranging the stations so that each one emits its own definite
wave dififerent in period or length from that of the others
it is possible to operate several stations at the same time ip
Fig. 77.—Receiving a message in a Marconi transatlantic station.
the same neighborhood without interfering with one an-
other. The apparatus is then said to be selective because
the instruments can be adjusted in a few seconds to receive
from any desired station and to exclude others.
The tuning coil consists of a cylinder wound with bare
copper wire spaced so that the turns do not touch one
another. Variable contacts called “sliders” are so ar-