Elementary treatise on electricity and magnetism : (1905)
Foster, G. C. (George Carey), 1835-1919, Joubert, J. (Jules François), 1834-1910, Porter, Alfred W. (Alfred William), 1863-1939 · London ; New York ; Bombay : Longmans, Green, and Co. · leaf 462
ith two circles, each of 25 centimetres radius, the magnetic fieldis almost exactly uniform for a distance of 2*5 centimetres on eachside of the middle point. Fig. 302 represents a galvanometer constructed upon thisprinciple, which is due to Helmholtz. With an instrument of thiskind, having in all… … Fig. 302. 358] TANGENT GALVANOMETER 439 If the circles are accurately set with their common axis per-pendicular to the magnetic meridian, the field = GG due to thecurrent is at right angles to the earths horizontal field, H, and theresultant field makes with the meridian an angle, a, given by…
Electricity · Magnetism
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