Modern practice of the electric telegraph. A handbook for electricians and operators (1872)
Pope, Frank L. (Franklin Leonard), 1840-1895 · New York : D. Van Nostrand · leaf 38
sing the circuit, precisely asif the wires themselves had been brought together. Thepoints of contact between the lever and the anvil aremade of platina, as ordinary metals would be fused bythe passage of the electric spark when the circuit isbroken. A spring beneath the lever restores it to… … FlQ/ll. 53. THE MORSE REGISTER.—Fig. 11 represents therecording apparatus, usually termed a register, which ismade in several different forms, all involving the sameprinciples. M is. the electro-magnet, the two ends ofthe wire forming the coils fyeing carried to the terminalbinding screws on the…
Telegraph
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