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 533
re the exact resistance of railjoints, as such resistance is small under ordinary circumstances, and all theconditions vary so much as to prevent accurate measurement being made.The resistance of rail joints is therefore measured in terms of length of therail itself, and there are numerous… … Fig. 77. Diagram of Method of Testing Rail Joints. A Weston or other reliable milli-voltmeter, with the zero point in the mid-dle of the scale, is the handiest instrument for making these tests. Thepoints b and c are fixed usually at a distance of 12 inches apart, the point ais then moved along-…
Electrical engineering
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