Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 704
> more perf :tion, is represented in Fig. 8392. [t consists of a mounted on a horizontal axis, with a knol or tin- hand at the extremity of the long arm, which i^ at the right in the figure. This lever is thrown up by a Bpring, bo a- to avoid contact with theon the frami rben the lever ia… … i on (no with t irm of the ! V\ hell tl.e . .,11 | the • 694 TELEGRAPH. of the electro-magnet losing all its magnetism, and the armature, with the lever, is carried back bythe action of a little spriDg, being a dot impressed upon the strip of paper. Should the distant opera-tor hold down the key, a…
Mechanical engineering
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