Abstract
FOR some time after the introduction of submarine telegraphy Sir William Thomson's mirror galvanometer was the only instrument delicate enough to receive the signals transmitted through a long cable. The spot of light reflected from the mirror moves over the scale and indicates every change of current in the cable. The clerks by degrees learn to interpret the motions of the spot of light, and are able to read the signals sent. The signals, however, must be read at the instant of arrival, and the clerk has no way of correcting what he receives except by having the signals repeated from the distant end.
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The Siphon Recorder and Automatic Curb Sender . Nature 15, 101–104 (1876). https://doi.org/10.1038/015101b0
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DOI: https://doi.org/10.1038/015101b0