Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 1342
he other isunwound. This arrangement corrects for any variation intemperature, for the effect on one spring would be counter-acted by the opposite effect on the other. The coil normallylies at 45° to the line joining the poles of the magnet, andconsequently the magnetic field created by a current… … Fig. 610 diagram of magnets, flux, coil and inner core of weston instrument