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SOUND-POWERED TELEPHONES
Sound-powered (battle) telephones are just what
their name implies; instead of a battery or generator,
the voice provides the power for the circuit. Failure
of the electrical power system has no effect upon the
sound-powered phones although one or more stations
can be knocked out by damage to the circuit. Every
sound-powered phone receiver is also a transmitter, and
vice versa. In other words, if one earpiece on a sound-
powered headset is inoperative, you normally can
continue to both talk and receive through the other ear-
piece. The same holds true for the mouthpiece.
The primary battle sound-powered telephone
circuits provide communication between selected battle
stations grouped on established circuits. No dialing is
necessary. When you plug into one of these circuits,
you can immediately communicate with anyone who
is plugged in on the same circuit. Additional stations
not on the circuit may be cut in or cut out by a
switchboard.
That there may be a number of stations on the same
circuit indicates the importance of strict compliance
with standard telephone talker procedures and
terminology. The duties of a telephone talker and
procedures employed when a sound-powered telephone
is used are covered both in Basic Military Require-
ments, NAVEDTRA 12018, and Sound-Powered
Telephone Talkers' Manual, NAVEDTRA 12097.
JL is the designation given to the circuit over which
the lookouts report. It is an important channel of vital
information to the bridge, CIC, and gun control. In
wartime the JL circuit is manned under all cruising
conditions. In peacetime it is manned when cir-
cumstances require extra lookout precautions, but it
may then be combined with other circuits.
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