Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 150
oft Iron Parts.—The instruments described in the previous three sections may-be used in measuring either direct or alternating currents andpressures. Their indications, however, are not reliable whenused in direct-current work because they are influenced byoutside fields and masses of iron. There… … Fig. 103 as the current is decreasing. With alternating currents,these objections are not present and the operation of theinstruments will be found to be quite satisfactory, providedthe outside field does not change at the same frequency asthe current to be measured. CLASS C 149.…
Electrical engineering
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