Notes on electricity and magnetism. designed as a companion to Silvanus P. Thompson's Elementary lessons (1891)
Murdock, J. B. (Joseph Ballard), 1851-1931, Thomson, Silvanus Phillips, 1851-1916 · New York, Macmillan & Co. · leaf 111
so reduces the current.It is therefore desirable to prevent a concentration of thelines of force in a small part of the field. In a coil rotat-ing in a uniform field, the advantage of the constant rateis attained by the change of the number of lines inclosedin the ratio of the sine of the angle… … Fig. 26. pole pieces are fre-quently attached tothe poles, partiallyencircling the arma-ture. By using longmagnets and heavypole pieces, the fieldmay be made nearlyuniform. An impor-tant modification ofthe field arises fromthe lines of force dueto the current in thearmature. Thus in Fig. 26,…
Electricity · Magnetism
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