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 336
M_ 1 B^^ sin e^ - BJ sin 6.-, One advantage of this method over the former one is that the … Fig. 204. suspending fibre remains untwisted, and consequently no correctionfor torsion is required. 244. Magnetic Charts.—The terrestrial magnetic elementsvary from one point of the globe to another. The simplest plan of showing the results is to record theobserved numbers on a geographical map,…
Electricity · Magnetism
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