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 34
elded by it one must have anexact knowledge of the value of the horizontal component of the earthsmagnetism. This quantity is continually changing, and is affected muchby the presence of large masses of iron and the existence of heavy currentsin the vicinity.Let r = the radius of a tangent… … Fig. 11. Tangent Galvanometers. 22 SYMBOLS, UNITS, INSTRUMENTS. For convenience the term 2wn2nn 5C tan 6. .e., the strength of the field produced at the center of the coil by the unit of current, is called the constant of thegalvanometer, and is represented by G, whence JC I = — tan 0G The current…
Electrical engineering
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