[Electric engineering.] . n ELECTRIC TRANSMISSION. 81 springs c, c, which also serve to carry the current into thecoil. The pointer is attached to the axis of the swingingcoil and plays over a horizontal scale. The stationarycoils a, a are connected in series in the circuit, so that thecurrent supplied to the motor or other device passes throughthem. The swinging coil is connected directly across the. Fig. 36. circuit, and a high resistance T is usually connected inseries with the swinging coil, so as to limit the current flow-ing through it to a very small amount; d, d are the currentterminal
[Electric engineering.] . n ELECTRIC TRANSMISSION. 81 springs c, c, which also serve to carry the current into thecoil. The pointer is attached to the axis of the swingingcoil and plays over a horizontal scale. The stationarycoils a, a are connected in series in the circuit, so that thecurrent supplied to the motor or other device passes throughthem. The swinging coil is connected directly across the. Fig. 36. circuit, and a high resistance T is usually connected inseries with the swinging coil, so as to limit the current flow-ing through it to a very small amount; d, d are the currentterminals of the instrument, i. e., the terminals that con-nect to the fixed coils; and e, e are the terminals of theswinging coil. 82 ELECTRIC TRANSMISSION. 14 94. From the way in which the instrument is connectedit is seen at once that the current in the fixed coils is thesame as the current supplied to the device operated; also,since the swinging coil is connected directly across the cir-cuit, like a voltmeter, the current in the swinging coil willbe proportional to the voltage between the lines. Now, thetwisting force exerted upon the swinging coil depends onthe current in the coil and the strength of the field. Thestrength of the magnetic field set up through the fixed coilis directly proportional to the current flowing through it, sothat the twisting force exerted on the swinging coil dependson
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