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Fourfold; folded or doubled twice. Quadruplex system (Electric Telegraph), a system by which four messages, two in each direction, may be sent simultaneously over the wire.

The electric catfish. [Written also raasch.]

A substance or device that has its conductivity altered in some way by electric waves, as a coherer.

Telegraphy using the radiant energy of electrical (Hertzian) waves; wireless telegraphy; -- the term adopted for use by the Radiotelegraphic Convention of 1912.

tgen ray ( (Phys.), a kind of ray generated in a very highly exhausted vacuum tube by the electrical discharge. It is capable of passing through many bodies opaque to light, and producing photographic and fluorescent effects by which means pictures showing the internal structure of opaque objects are made, called radio…

other, or the action upon such chemical agents of some form of energy, as heat, light, or electricity, resulting in a chemical change in one or more of these agents, with the production of new compounds or the manifestation of distinctive characters. See Blowpipe reaction, Flame reaction, under Blowpipe, and Flame.…

use, source, a motive, reason, or ground of explanation; as, he referred the phenomena to electrical disturbances. To refer one's self, to have recourse; to betake one's self; to make application; to appeal. [Obs.] I'll refer me to all things sense. Shak.

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

cede from each other, or to resist each other's nearer approach; as, molecular repulsion; electrical repulsion.

owish brown solid inflammable substances, of vegetable origin, which are nonconductors of electricity, have a vitreous fracture, and are soluble in ether, alcohol, and essential oils, but not in water; specif., pine resin (see Rosin).

pertaining to resin; of the nature of resin; resembling or obtained from resin. Resinous electricity (Elec.), electricity which is exited by rubbing bodies of the resinous kind. See Negative electricity, under Negative.

A certain hindrance or opposition to the passage of an electrical current or discharge offered by conducting bodies. It bears an inverse relation to the conductivity, -- good conductors having a small resistance, while poor conductors or insulators have a very high resistance. The unit of resistance is the ohm. Resista…

as neurasthenia, by rest and isolation with systematic feeding and the use of massage and electricity.

allic wire used for regulating the resistance of a circuit, or varying the strength of an electric current, by inserting a greater or less length of it in the circuit.

An instrument for measuring currents, especially the force or intensity of electrical currents; a galvanometer.

Any apparatus by which an electrical current is originated. [R.]

A connecting wire of an electric or voltaic apparatus, traversed by a current.

An instrument for detecting the presence or movement of currents, as of electricity.

A contrivance for adjusting or regulating the strength of electrical currents, operating usually by the intercalation of resistance which can be varied at will. Wheatstone. --Rhe`o*stat"ic, a.

An instrument which periodically or otherwise interrupts an electric current. Wheatstone.