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 221
the beamswings over the scale, which iscalibrated to read in amperes. Aplumb-bob indicates when theinstrument is properly leveled.The instrument depicted illus-trates a 0 to 300 scale, and can becalibrated for a larger capacity,say 0 to 400 amperes, by slidingthe counterweight along the beam toward… … Fig. 191.—Balance Beam Gravity-Ammeter—Westinghouse Type. AMMETERS. 20b
Electricity · Magnetism
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