Instructions for testing telegraph lines and the technical arrangements of offices (1878)
Schwendler, Louis, 1838-1882 · London : Trèubner · leaf 41
F the resistance of the testing battery,and f that of the standard—both we know by formertrials—and suppose for a = aand IV = IV we get a deflection a° with E, WHEATS TONES BRIDGE. 25 and for a = a and vj = w we get the same deflection a with e; then, as caneasily be proved, we have E_(^+-) 6 +… … WHEATSTONES BMIDGE. 27 Explanation of the Diagram. G a sensitive galvanometer with coils g and g.g = 4000 units and g = 1000 units resistance,C a commutator, by which the coils can be connectedup successively or parallel. Stopper in X only, we have g + g = 5000 units. Stoppers in 00, we have ^ ^ ,…
Telegraph · Telegraph lines
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