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 136
net moves vvathin them. It is supported by v/heelsmoving upon the inclined rails. When the bend ofthe magnet reaches the coils, the axle of the wheels nearB strikes a spring, and brea.ks contact at B, by pushingalong a little rod below the wheels. As the magnetfalls back by gravity, the axle… … 191. Revolving Coil. — Thisinstrument consists of a U-magnetfixed upon a stand, in a verticalposition, and a circular coil of in-sulated copper wire, C (Fig. 69), soarranged as to revolve on a verticalaxis between the magnetic poles.The rotation is effected in a differ-ent manner from any…
