Modern practice of the electric telegraph : a handbook for electricians and operators (1874)
Pope, Frank L., 1840-1895 · New York : D. Van Nostrand · leaf 59
chfacility as if it were one continuous circuit. On one ortwo occasions the stations at Hearts Content, New-foundland, and San Francisco, California, have beenplaced in direct communication with each other, theoperators at these widely separated points conversingwith each other across the entire… … Fig. 26. the most convenient and serviceable form in which thebutton or switch, and its connections, can be arrangedfor the purpose of changing the circuits. The instru-ments, batteries, &c, are shown in outline, for conve-nience of explanation. M and M are the eastern andwestern relays, S and…
Telegraph
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