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 212
these experiments,in some of which long wires were used, he at onceapplies the new facts to the telegraph. The pres-ent form of the American telegraph is claimed tohave been suggested in 1832, by Dr. C. T. Jackson,and by Professor Morse. It was finally matured byProfessor Morse, and introduced by… … consists of an electro-magnet, armature, and lever,arranged in a similar manner to the magnetometer,(Fig. 131.) At the extremity of the lever is a bluntpoint, which marks the strip of paper when the elec-tro-magnet is in action. If one wire from the batteryis placed in one of the screw-cups,…
