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Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
ylinders of copper or brass in which induced currents are generated. These may be slipped on or off the coils, to intensity or moderate the strength of the current, which is directed by appropriate wires to the parts under treatment. Electro-Medical machine. E-lec-trom′e-ter. An instrument to measure the amount of an electrical force. In Coulomb's torsion electrometer (a) the force opposed to that of electricity is the resistance to twisting offered by an elastic thread. In Henly's quadrant electrometer (b) the electric force is measured by the amount of repulsion which it produces upon a pith-ball attached to a silk fiber suspended from the center of a graduated are. c is the gold-leaf electroscope. See electroscope. Sir William Thomson's and Varley's electrometers are the most delicate of all, and are used in reading the insulating power of telegraph-cables. See galvanometer. Electrometers. The strength of the electric force excited by the rubbing of gla