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That is not a degaussing coil, but a field-neutralizing coil, which carries a constant adjustable DC current to counter the Earth's magnetic field.
A degaussing coil works by applying a large, decaying AC current once when the set is turned on. This actually magnetizes the metal CRT shield opposite of the Earth's field, thus canceling it inside the CRT.
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Old TV literature, New York World's Fair, and other miscellany
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