History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 94
asthe circuit remains open for a longer time. We therefore seethat we may at pleasure, by acting at one of the stations, traceupon the paper which is unrolled at the other, a succession ofpoints or lines, separated by blank intervals, which may be com-bined in very various manners, in order to give… … Fig. 34. the strip of paper is wound, and clock-work, with rollers, whichgive the strip a steady motion onwards under the pen upon thelever of the electro-magnet. The recording apparatus depends upon the combination oftwo essentially different parts ; one consists of a lever, which,when it is…
Telegraph
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