Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 122
ms, in series with astraight wire, also 10 ohms resistance, thusforming a system of fifteen equal steps.Across the whole a pd of 15 volt is appliedfrom a secondary cell, thus providing a pdof j\y volt per step. Any fraction is thentapped off by means of a radial switch on theresistance coils and a… … Fig. 1.—Crompton Potentiometer point which represents its emf on the basisgiven above (see fig. 1). 2. The Nalder Potentiometer.—In thisinstrument the slide wire is dispensed with.There are a great number of stops with re-sistance steps between, and a small dial con-taining a few stops arranged to…
Electrical engineering
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