Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 349
xactly the proper length, usually twomillimetres, the action of the coils upon the core is exactly bal-anced. Any alteration in the resistance of the circuits by in-crease of the length of the voltaic arc disturbs this balance, andthe iron core with the top carbon attached descends and… … ig. 192.
Electrical engineering
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