Modern practice of the electric telegraph : a handbook for electricians and operators (1874)
Pope, Frank L., 1840-1895 · New York : D. Van Nostrand · leaf 91
erator 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… … line: Fig. 50. 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 TELEGRAPH LINES. 79 The galvanometer coils are wound with two…
Telegraph
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