History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 411
next put in motion byclock-work, and thus the cloth,wet with the solution contained in the trough d, is made to passuniformly over the leaden cylinder a, below the point of the im-press wire. The apparatus is now ready for signalling, which is done bypressing down the finger-board, h, so as to… … Fig. 90. AMPERES TELEGRAPH. 393 is printed upon the cloth, by the electric fluid decomposing theferrocyanate of potash, thus forming cyanate of iron. If the cir-cuit is formed and broken rapidly, a succession of dots will beprinted upon the cloth; if formed and broken at long intervals,the result…
Telegraph
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