Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 221
ings over the scale, which is calibrated to read in amperes. A plumb-bob indicates when the instrument is properly leveled. The instrument depicted illus-trates a 0 to 300 scale, and can be calibrated for a larger capacity, say 0 to 400 amperes, by sliding the counterweight along the beam toward… … Fig. 191.—Balance Beam Gravity-Ammeter—Westinghouse Type. AMMETERS. 203 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 tlie above, the magnetic body is…
Electricity · Magnetism
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