The telegraph manual: a complete history and description of the semaphoric, electric and magnetic telegraphs of Europe, Asia, Africa, and America, ancient and modern.

THE MIODERN RELAY MAGNET. 447
thence to the metallic axle frame G, thence up the lever of the
armature, thence with the screw E, thence with the brass work
H, thence underneath the board to post c, and from there
through the register magnets to the other end of the battery.
This completes the local voltaic circuit. If the circuit be
broken at E, the local battery fails to act. Every time the
current is transmitted over the line by the contact of a key at
a distant station, the current flows through the relay magnet t
the local circuit is then closed, and the local battery curren!
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