Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 310
ional 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 wattmeter coils for any length of time, the number ofrevolutions of the armature,… … 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 to produce the field, and areconnected in series with the circuit,as in Fig. 259.…
Electricity · Magnetism
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