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
he platform upon v/hich they aresecured comes in contact with the wire-spring, A,and, by the movement produced in that, breaks thecontact at B. The current being interrupted, thecoils slide down the rails by the force of gravity,until the platform reaches a pin on the rod near B,whose movement… … 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…
