Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 162
Fig. 1.—Eesistance Frame are the terminals. This resistance frame pro-vides a fixed resistance and can appropriately,in accordance with the above suggestion, betermed a resistance. Rheostat or Variable Resistance.—The construction of a rheostat is illustrateddiagrammatically in fig. 2. The… … Fig. 2.—Rheostat at D, and when moved over the contacts,inserts more or less of the resistance intothe circuit. Resistance Materials. — For the ma^jority of purposes resistances are made ofmetal, the metals most commonly used beingiron, German silver, and manganin. Iron,being the cheapest, is most…
Electrical engineering
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