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 59
hfacility 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… … 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 S the…
Telegraph
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![An illustration from The Telegrapher [microform] (1864)](https://img.insideoutlibrary.com/img/200/ia-telegrapher04nati-313-141.webp)
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