A coupling that connects two shafts by means of a magnetic field.

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A sphere of specified radius about the magnetic compass location to be kept free of any magnetic or electrical equipment which would interfere with the compass.


The technique of transporting high-energy, high-current electron beams from an accelerator to a target through a region of high-pressure gas by creating a path through the gas where the gas density may be temporarily reduced; the gas may be ionized; or a current may flow whose magnetic field focuses the electron beam on the target.


  1. To smooth the surface of concrete or stone. 2. The arrangement of connecting wires in a circuit to prevent undesirable coupling and feedback. 3. To shape a tool. 4. To restore a tool to its original shape and sharpness.


A sealed, hollow part attached to the compass card of a magnetic compass as part of the compass card assembly, to provide buoyancy to reduce the friction on the pivot bearing


Waves of associated electric and magnetic fields characterized by variations of the fields. The electric and magnetic fields are at right angles to each other and to the direction of propagation. The waves are propagated at the speed of light and are known as radio (Hertzian) waves, infrared rays, light, ultraviolet rays, X-rays, etc., depending on their frequencies.


A radar reflector consisting of three mutually perpendicular flat reflecting surfaces designed to return incident electro- magnetic radiation toward its source. The reflector is used to render objects such as buoys and sailboats more conspicuous to radar observations. Since maximum effectiveness is obtained when the incident beam coincides with the axis of symmetry of the reflector, clusters of reflectors are sometimes used to insure that the object will be a good reflector in all directions. Also called TRIHEDRAL REFLECTOR.


The strength of a magnetic field. Also called MAGNETIC INTENSITY.


A line connecting points of equal magnetic intensity, either the total or any component


A permanent magnet placed vertically in a tube under the center of a marine magnetic compass, to correct for heeling error.


A line of horizontal magnetic force of the earth. A compass needle without deviation lies in the magnetic meridian.

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