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 253
236 DAVIS S MANUAL. Fig. 162. … 374. The inner coil being placed at right anglesEo the other, and the cups on the stand connected with the galvanic battery, thefaces of each coil immediatelyexhibit north and south polarity,like those of De la Rives Ring(<§> 185); and B is obliged tomake a quarter of a revolution inorder to…
