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 305
ndhas the advantage of beingadapted for use with eitherdirect or alternating cur-rents. 273. Portable Dyna-mometer Ammeter.—Aportable commercial form ofelectrodynamometer for useas an alternating or directcurrent ammeter is illus-trated in Fig. 254. Theoperation and principles in-volved are… … Fil . 254.—Dynamometer Ammeter forAlternating or Direct Currents.Portable Form. graduated toa direct current in read directlycircuitby taking tne averagethe current reversed. lne ftxecl con iscoils wound with a different number of turns, each of whichis inserted in series with the movable coil and…
Electricity · Magnetism
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