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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I
CHAPTER III.
THE TRANSMITTING APPARATUS.
The principal instruments composing the apparatus used
for sending the wireless messages comprise an induction
coil, or in its place a transformer, a key, a spark gap, a
condenser, and a helix. <
The current supply available will determine the type
of the instruments, and whether an induction coil or a
transformer is used. Unless current mains for light and
power are already installed, it must be generated by an
engine and dynamo, or recourse had to batteries. Induc-
tion coils may be operated on either direct or alternating
current. Dry cells are most commonly employed to furnish
Fig. 28.—Diagram showing how batteries may be arranged in
“series” or “series multiple.”
the current for small induction coils, but a storage or some
form of renewable primary cell, such as the Fuller and
Edison, is necessary if the coil is a large one.
When dry cells are used, they should be connected in
27