Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 221
ings 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, Fig. 191.-say 0 to 400 amperes, by slidingthe counterweight along the beam… … -Balance Beam GravityAmmeter—Westinghouse Type. AMMETERS. 203
Electricity · Magnetism
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