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

736 TELEGRAPH APPARATUS.
brought into the path of the arm 1, and the operation be
stopped.
Claim.-The snail K, or its equivalent, and dial plate,
combination with the single key u.
XI. IMPROVEMENT IN TELEGRAPHIC REPEATERS.
Patented March 17, 1857, by Moses G. Farmei and Asa F. Woodman.
In engraving, fig. 1, A" A/', two distant stations, this invention being supposed to be placed at an intermediate one. If
the independent circuit be broken by an operator at A/", the reXI.
1
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