Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 309
field of the cur-rents in the two coils,and the retarding angularforce also proportional tothe magnetic field set up,the armature must rotateat such a speed that theelectromagnetic drivingtorque is exactly equalto the electromagneticretarding torque. Then with a constant pressure maintainedin the… … Fig. 258.—Drum-Wound Armature ofThomson Recording Wattmeter. ELECTROD YXAMICS. 291 A high resistance is inserted in series with the armature andit is connected to a circuit just like the volt coil of the indi-cating wattmeter in Fig. 255. The stationary current coilsare wound in the same direction…
Electricity · Magnetism
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