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degaussing| Removal of magnetism from a device. The term is usually used in reference to colour monitors and other display devices that use a cathode-ray tube (CRT). External magnetic forces, such as the Earth's natural magnetism or a magnet placed close to the monitor, can cause distorted images and colours. |
| In World War II, ships were degaussed to prevent them from detonating magnetic mines. This involved encircling each ship with a conductor, through which an electric current was maintained. |
| Most monitors automatically degauss the CRT whenever they are switched on. In addition, many monitors have a manual degauss button that performs a more thorough degaussing of the CRT. |
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