A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 998
e currents in A and L.Similarly, all the other forces between the coils are proportional to LXXV SIEMENS ELECTRODYNAMOMETER 973 EI ; therefore the couple acting on the movable arm is also pro-portional to EI. Thus, the displacement of the sliding weightnecessary to restore equilibrium is… … Fig. 910.—Diagram of the Kelvin watt balance. Owing to the fact that the movable coils LM are placed in parallelwith the lamp, their resistance must be high, for the same reasonthat the resistance of a voltmeter must be high (p. 875). For thisreason it is customary to introduce an extra fixed…
Physics
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