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 237
nstrument represented in Fig. 155, is similarto the one described in •§>• 167, except that the re-volving bar is of iron, enclosed in a helix whichrotates with it. The battery current traverses thehelix and one half of the bar. As the bar becomesan electro-magnet, it revolves like the one… … MECHANICAL POWER. 221 The revolution of either an electro-magnet or a steel magnet on its axis is properly classed with that of a „. ,^^ conductor around a magnet. When theconductor and mag-net are fastened to-gether, the latter iscarried round by themovement of theformer, as stated in<5. 171.…
