Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 80
0ILS in the following cut. _ /~^\ v to v--meah.cength In the cut the exciting coils \£_J l of test piece! are in two parts, and receive ballistic current from the battery and galvanometer . , ,. through the ammeter, resist- FlG. 3. Arrangement for Hopkinson s ai-ance, and reversing switch,… … 68 MAGNETIC PROPERTIES OF IRON. to be thrown clear out of the yoke when released by pulling out the looseend of the test bar by the handle shown. In operation, the exciting current is adjusted by the resistance J?, the testbar suddenly pulled out by the handle, thus releasing the test coil and…
Electrical engineering
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