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resistance substantially equal to 109 units of resistance of the C.G.S. system of electro-magnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice 14.4521 grams in mass, of a constant cross-sectional area, and of the length of…

An instrument similar to a mariner's compass, but without magnetic needles, and having two sight vanes by which bearings are taken, esp. such as cannot be taken by the compass.

The quality or state of being permeable. Magnetic permeability (Physics), the specific capacity of a body for magnetic induction, or its conducting power for lines of magnetic force. Sir W. Thomson.

s, in which the exciting field is induced by the alternating current in a short-circuited magnetic core instead of being produced by an external magnet.

The power of exciting the organs of the brain by magnetic or mesmeric influence.

metal with a thin plate of precious or bright metal, as by mechanical means or by electro-magnetic deposition.

Of or pertaining to the magnetic pole, or to the point to which the magnetic needle is directed.

See Polarity, and Polar, n. Magnetic pole. See under Magnetic. -- Poles of the earth, or Terrestrial poles (Geog.), the two opposite points on the earth's surface through which its axis passes. -- Poles of the heavens, or Celestial poles, the two opposite points in the celestial sphere which coincide with the earth's…

uids; and electricity, obtained by chemical action, and applied to produce alternation of magnetic force. (b) An engine, or machine, the object of which is to receive and modify force and motion as supplied by some natural source, and apply them to drive other machines; as a water wheel, a water- pressure engine, a ste…

t is a sulphide of iron, and is remarkable for being attracted by the magnet. Called also magnetic pyrites.

Standing in relation or connection; as, the electric and magnetic forcec are closely related.

Röntgen. They also ionize gases, but cannot be reflected, or polarized, or deflected by a magnetic field. They are regarded as nonperiodic, transverse pulses in the ether. They are used in examining opaque objects, as for locating fractures or bullets in the human body.

The thin oxide which forms on the surface of iron forgings. It consists esentially of the magnetic oxide, Fe3O4. Also, a similar coating upon other metals. Covering scale (Zoöl.), a hydrophyllium. -- Ganoid scale (Zoöl.) See under Ganoid. -- Scale armor (Mil.), armor made of small metallic scales overlapping, and fas…

Formerly, magnetic iron ore, or loadstone.

ting small quantities of iron in any substance by means of a very delicate combination of magnetic needles.

On in a state of magnetic or mesmeric sleep.

A tendency in the end of a magnetic needle to point toward the south pole. Faraday.

onal excitement; sensibility, in its broadest acceptation; impressibility; sensitiveness. Magnetic susceptibility (Physics), the intensity of magnetization of a body placed in a uniform megnetic field of unit strength. Sir W. Thomson.

roduced in two separate circuits. In the receiver these variations are utilized by electromagnetic devices and levers to move a pen as the pencil moves. --Tel`au*tog"ra*phist (#), n.

cial days, designated by scientists of different nations or stations, for making synoptic magnetic, meteorological, or other physical observations.