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 91
r will there-fore, in many cases, be obliged to depend upon his owningenuity for the best method of testing applicable toeach particular case. By carefully studying, however,the principles heretofore explained, the intelligent tele-grapher will usually be able to cope with any difficultythat may… … ployed upon the European lines, the instruments usedare the differential galvanometer and a set of standardresistance coils (44). The arrangement of the connections will be under-stood by reference to Fig. 50. TESTING TELEQRAPH LINES. *^9 The galvanometer coils are wound with two wires ofthe same…
Telegraph
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