Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 54
Fig. 9. Cary-FosterBridge. Then : S, + (a — aj p. Special commutators are upon the market which have for their purposethe easy exchange of S\ and S2. To avoid thermal effects, which are quite considerable with resistancesmade of some materials, the battery should be commutated for each positionof… … Fig. 10. Thomsons Double Bridge. Thomsons J»out»le JBridg-e.— If the resistances in a Wheatstonesbridge be much less than one ohm in magnitude, the accuracy of the results obtained is inferior. Samples ofcopper or other wires of moderatelengths and diameters have suchsmall resistances that the…
Electrical engineering
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