A magnet occurring in nature.
Related Terms |
HEELING MAGNET
A permanent magnet placed vertically in a tube under the center of a marine magnetic compass, to correct for heeling error.
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MAGNETIC FILTER
A filter element that, in addition to its filter medium, has a magnet or magnets incorporated into its structure to attract and hold ferromagnetic particles.
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COMPASS
Navigational instrument showing the direction of the vessel in relation to the Earth's geographical poles or magnetic poles. Commonly consists of a magnet aligned with the Earth's magnetic field, but other technologies have also been developed, such as the gyrocompass.
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KEEPER
A piece of magnetic material placed across the poles of a permanent magnet to assist in the maintenance of magnetic strength.
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MAGNETIC
Of or pertaining to a magnet or related to magnetic north.
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MAGNET
A body which produces a magnetic field around itself. It has the property of attracting certain materials capable of being magnetized. A magnet occurring in nature is called a natural magnet in contrast with a man-made artificial magnet.
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MAGNET
A body which produces a magnetic field around itself. It has the property of attracting certain materials capable of being magnetized. A magnet occurring in nature is called a natural magnet in contrast with a man-made artificial magnet.
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MAGNETISM
The phenomena associated with magnetic fields and their effects upon magnetic materials, notably iron and steel. The magnetism of the north-seeking end of a freely suspended magnet is called red magnetism; the magnetism of the south-seeking end is called blue magnetism. Magnetism acquired by a piece of magnetic material while it is in a magnetic field is called induced magnetism. Permanent magnetism is retained for long periods without appreciable reduction, unless the magnet is subjected to a demagnetizing force. The magnetism in the intermediate iron of a ship which tends to change as the result of vibration, aging, or cruising in the same direction for a long period but does not alter immediately so as to be properly termed induced magnetism is called sub permanent magnetism. Magnetism which remains after removal of the magne- tizing force may be called residual magnetism. The magnetism of the earth is called terrestrial magnetism or geomagnetism.
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MAGNETIC POLE
1. Either of the two places on the surface of the earth where the magnetic dip is 90°, that in the Northern Hemisphere being designated north magnetic pole, and that in the Southern Hemisphere being designated south magnetic pole. Also called MAGNETIC DIP POLE. See also MAGNETIC LATITUDE, GEOMAGNETIC POLE, MAGNETIC LATITUDE. 2. Either of those two points of a magnet where the magnetic force is greatest.
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HARDENING
Accomplished by heating the steel beyond the critical temperature and following by relatively fast cooling. If heating for hardening is being accomplished in the forge fire the color should be a full red and to check on the temperature a magnet may be used, as the steel at or above the critical temperature should be non-magnetic. If the magnet is being used while the temperature is being raised from the room temperature, the correct point to stop heating is where the steel no longer responds to the pull of the magnet. If a furnace is being used to heat the steel to the hardening heat a pyrometer aids greatly in determining the critical temperature.
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