Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity (1854)
Davis, Daniel · Boston : Palmer and Hall · leaf 235
in a circular coil.The same current traverses the coil and the wire sur-rounding the rotating bar, but its direction is changedonly in the latter. When the circuit is completed,the revolving bar moves so as to bring its poles intoa direction corresponding with those of the coil.This motion depends… … are so arranged as to reverse the current when theelectro-magnet is at right angles with the coil. TheFia- 151 north pole of the magnet places itself within the north pole of the coil, andnot, as might at first sight be ex-pected, within its south pole. Thisapparent anomaly is due to the…
