Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 276
net, E, whose armature, A, is hung so asto move very easily. This magnet is connected with the line wire,while the receiving instrument is only connected with a smallbattery in the room where the message is received, called a localbattery. The current from this enters the post, C, and passesthence… … Fig. 328. to the battery. So this current is broken except during the timewhen a current is passing through the magnet E. All the workrequired of the main current is to move the lever p through a verysmall distance, so closing the circuit of the local battery, and aspring, r, returns it to its…
Physics
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