Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 372
rmed terminals, according to the method of winding. 331. Open-Coil Armatures.—The armatures previouslydescribed are called closed coil armatures, because the coils areall connected, forming a closed winding around the armature.When very high potentials are to be generated, as, for exam-ple, 8000… … becomes very high, and may jump or flash from bar tobar, or even from brush to brush. Open coil armatures aredesigned to obviate this difficulty, and are used principallyfor arc lighting.* A simple form of open coil armature isdepicted in Fig. 332. Two coils, A,B, wound at oppositepositions on the…
Electricity · Magnetism
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