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
nthe centre of the coil. In this position, its poles liein the same direction as those of the electro-magnetdescribed above. 348. Double Revolving Magnet. — In this in-strument, represented in Fig. 152, there are two „. -_„ electro-maarnets of the Fig. 152. ® U form and of the samesize, arranged to… … REVOLVING WHEELS. 219 the current passes, both magnets become charged,and, their opposite poles attracting each other, theymove in opposite directions until they come into thesame line. At this moment the circuit is interruptedby the break-piece, and the poles move past eachother by their acquired…
