Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 690
The great increase in the number of sections in the commutatorreduces the sparking at the brush contacts and prevents the cur-rent from discharging across from one brush to the other. Thenumber of sections formerly used was eight; in the present ma-chines, from forty-eight to one hundred and forty… … Fig. 44*7. As the intensity of the spark at the commutator, as well as thesmoothness of the current, depends largely upon the method inwhich the armature coils are wound and connected to it, Mr.Weston has bestowed much attention upon different systems ofwinding as applied to cylindrical armatures.…
Electrical engineering
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