History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 422
ning in the face ofthe instrument, as at 0 in Fig. 9o. Whenthat particular sign has appeared the re-quired time to be observed, that circuitis opened, the magnet m loses its power,and the longer arm of the lever pre-ponderates and falls down to its firstposition, and the card with its sign…
Telegraph
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