The standard manual of dynamos and practical application of dynamo-electric machinery (1915)
MacFadden, Carl K. [from old catalog], Ray, William D., [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 117
current,has for its core a bundle of loose iron wires, each alterna-tion of the current will tend to set the individual wiresin vibration and it is this effect which often makes amagnet^ carrying alternating current, emit a humming 112 TYPKS OF ARC I.AMPS. noise. For this reason transformers will… … HEAT FIGURE 32.—DIAGRAM OF CIRCUITS OF HEATMOVEMENT I.AMP. current from being generated in the spool, which mightotherwise act as a secondary coil of a single turn. Thefeeding mechanism of alternating current arc lamp?should be as free from magnets as possible for any mag-net especially with an…
Electrical engineering · Electric machinery
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