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The Shipboard Degaussing System, Continued
Degaussing Coils The degaussing coil is actually a large diameter electrical wire. As you
might have guessed, when it is energized it produces an electromagnetic
field.
The following table gives a description of each coil and its effect on the
ship’s magnetic field.
Coil
A
F
L
Q
M
Description
The A, or athwartship, coil is made up of loops in
vertical fore-and-aft planes. The function of the A
coil is to produce a magnetic field that will counteract
the ship’s athwartship permanent and induced
magnetism.
The F, or forecastle, coil encircles the up to the
forward l/3 of the ship. It is usually located just
below the forecastle or uppermost deck. The function
of the F coil is to produce a magnetic field that will
counteract the ship’s longitudinal permanent and
induced magnetism.
The L, or longitudinal coil is made up of loops in
vertical planes parallel to the ship’s frames. The
function of the L coil is to produce a magnetic field
that will counteract the ship’s longitudinal permanent
and induced magnetism.
The Q, or quarterdeck, coil encirles the after l/3 of a
ship. It serves the same purpose as the F coil.
The M, or main, coil encircles the ship in a horizontal
plane, usually just below the waterline. The function
of the M coil is to produce a magnetic field that will
counteract the ship’s vertical permanent and induced
magnetism.
Degaussing and
The deviation to the magnetic compass resulting from these currents is
the Magnetic
Compass
neutralized as much as possible by a procedure called compensation.
The remaining deviations caused by the degaussing coils are observed
and plotted on the left side of the deviation table.
2-13
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