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When you speak into the mouthpiece, the sound waves of
your voice cause a diaphragm to vibrate. The vibrations are
transferred from the diaphragm through a drive rod to an
armature centered in a wire coil. The current then is transmitted
to a receiver (the earpiece), where the process is reversed. The
person at the other end of the circuit hears the sounds you
transmitted.
The earpiece, though shaped differently from the mouthpiece,
also contains a diaphragm, an armature, and a coil. The earpiece
and the mouthpiece can be used interchangeably; you can talk
into the earpiece or hear through the mouthpiece. This feature is
important to remember should a failure occur in one of the
pieces. It is also important because you need to be aware that an
earpiece turned away from your head will pick up distracting
noises.
Q1.
Q2.
Q3.
What is the power source of the sound-powered
telephone system?
How do yon generate enough current to carry your voice
to all other phones in the circuit?
What action should you take if your mouthpiece fails?
IMPORTANCE OF SOUND-POWERED
TELEPHONES
Communications are of vital importance to a shipboard
organization.
The most important interior communications
system used aboard ship is the sound-powered telephone.
Without this system to exchange accurate, up-to-date information,
the ship would be unable to function properly and achieve its
mission.
Can you think of an instance in your past when you were
given inaccurate information or you received it too late to be
useful? What kind of problems did that cause you? Imagine,
then, commanding officers trying to lead their warships during a
1-2
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