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 139
g it into contact with a silverpin, not shown in the cut, which connects it directlywith the coil, without the intervention of the break-piece. If the direction of the battery current is re-versed, the needle revolves in the opposite direction. 195. Revolving Coil and Magnet, — In this in-strument,… … REVOLVING COIL AND MAGNET. 123
