The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 165
TY AND MAGNETISM. this principle which will measure either current strengthor difference of potential, produced either by direct oralternating currents, and are not liable to variation fromany of the causes mentioned. Among these the volt-meter, patented by Cardew in 1886, has a prominentplace. Its… … Fig. 58. platinum wire, 8 feet long, is stretched in four lengthsin a horizontal tube, by attachment to a metal frameand pulleys, as shown at a, a^ t, t in Fig. 59. This tubeis made of very thin metal, one third of its length beingiron and two thirds brass, to maintain constancy oflength between…
Electricity · Magnetism
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