Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 434
changes in thestrength of the magnet are sufficiently compensated by varia-tions in the resistance of the wires. 381. Kelvins Current Balance. — Lord Kelvin has intro-duced a type of instrument for the determination of currents,in which the force exerted by one portion of a circuit onanother is… … Fig. 263. A, B, 0, D are four horizontal fixed coils, between whichis suspended by means of a flexible ligature of fine wiresab, ah\ a light beam carrying the coils 31, JV. When the cur-rent passes, the balanceof the arm is disturbedby the forces exertedby the fixed coils onthe movable ones, theend…
Physics
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