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Galvanometer :: Galvanometer (n.) An instrument or apparatus for measuring the intensity of an electric current, usually by the deflection of a magnetic needle..

Armature :: Armature (n.) A piece of soft iron used to connect the two poles of a magnet, or electro-magnet, in order to complete the circuit, or to receive and apply the magnetic force. In the ordinary horseshoe magnet, it serves to prevent the dissipation of the magnetic force..

Diamagnetic :: Diamagnetic (a.) Pertaining to, or exhibiting the phenomena of, diamagnetism; taking, or being of a nature to take, a position at right angles to the lines of magnetic force. See Paramagnetic..

Phrenomagnetism :: Phrenomagnetism (n.) The power of exciting the organs of the brain by magnetic or mesmeric influence.

Ampere :: Ampere (n.) The unit of electric current; -- defined by the International Electrical Congress in 1893 and by U. S. Statute as, one tenth of the unit of current of the C. G. S. system of electro-magnetic units, or the practical equivalent of the unvarying current which, when passed through a standard solution of nitrate of silver in water, deposits silver at the rate of 0.001118 grams per second. Called also the international ampere..

Magnetize :: Magnetize (v. t.) To communicate magnetic properties to; as, to magnetize a needle..

Dolerite :: Dolerite (n.) A dark-colored, basic, igneous rock, composed essentially of pyroxene and a triclinic feldspar with magnetic iron. By many authors it is considered equivalent to a coarse-grained basalt..

Diabase :: Diabase (n.) A basic, dark-colored, holocrystalline, igneous rock, consisting essentially of a triclinic feldspar and pyroxene with magnetic iron; -- often limited to rocks pretertiary in age. It includes part of what was early called greenstone..

Magnetite :: Magnetite (n.) An oxide of iron (Fe3O4) occurring in isometric crystals, also massive, of a black color and metallic luster. It is readily attracted by a magnet and sometimes possesses polarity, being then called loadstone. It is an important iron ore. Called also magnetic iron..

Needle :: Needle (n.) See Magnetic needle, under Magnetic..

Induce :: Induce (v. t.) To produce, or cause, by proximity without contact or transmission, as a particular electric or magnetic condition in a body, by the approach of another body in an opposite electric or magnetic state..

Inclinnometer :: Inclinnometer (n.) An apparatus to determine the inclination of the earth's magnetic force to the plane of the horizon; -- called also inclination compass, and dip circle..

Magnetograph :: Magnetograph (n.) An automatic instrument for registering, by photography or otherwise, the states and variations of any of the terrestrial magnetic elements..

Electro-chronograph :: Electro-chronograph (n.) An instrument for obtaining an accurate record of the time at which any observed phenomenon occurs, or of its duration. It has an electro-magnetic register connected with a clock. See Chronograph..

Declinometer :: Declinometer (n.) An instrument for measuring the declination of the magnetic needle.

Scale :: Scale (n.) The thin oxide which forms on the surface of iron forgings. It consists essentially of the magnetic oxide, Fe3O4. Also, a similar coating upon other metals..

Photomagnetic :: Photomagnetic (a.) Of or pertaining to photomagnetism.

Emery :: Emery (n.) Corundum in the form of grains or powder, used in the arts for grinding and polishing hard substances. Native emery is mixed with more or less magnetic iron. See the Note under Corundum..

Dipolar :: Dipolar (a.) Having two poles, as a magnetic bar..

Basalt :: Basalt (n.) A rock of igneous origin, consisting of augite and triclinic feldspar, with grains of magnetic or titanic iron, and also bottle-green particles of olivine frequently disseminated..

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