Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 222
Fig. 191.—Balance Beam Gravity-Ammeter—Westinghouse Type. AMMETERS. 20b … Fig. 192.—Thomson Inclined Coil Ammeter. ance of the instrument being about .0001 ohm. The instru-ment may be calibrated for an alternating or direct currentcircuit. 207. Thomson Inclined Coil Ammeter. —In many typesof ammeters, beside the above, the magnetic body is apiece of iron, rather than a…
Electricity · Magnetism
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