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 299
currents are induced by electro-mag-nets whose magnetism is alternately acquired andlost. These instruments consist essentially of doublehelices containing bars or wires of soft iron. Themagneto-electric current is thus obtained in con-junction with that excited by electro-dynamic in-duction, and… … 178. A short piece of fine platinum wire is securedby binding screws to the wires of a large electro- POWER OF BATTERIES. 283 magnet. The wires are uncovered at that point,and being connected by the platinum, a part of thebattery current passes through it. It should be longenough not to be fully…
