Instructions for testing telegraph lines and the technical arrangements of offices (1878)
Schwendler, Louis, 1838-1882 · London : Trèubner · leaf 43
the case when one end of theline only can be brought in connection with the bridge,the other end being put to earth. For instance— Stopper 1 in, 2 and 3 out—resistances can be measured 28 ELECTRICAL TESTLNG. of which hotli the ends are in the testing office and earthis then off battery and bridge.… … DIFFERENTIAL GALVANOMETER. 29 SECTION IL THE DIFFERENTIAL GALVANOMETER. I. Explanation of the Diagram.—Fig. 4 gives adiagram of the differential arrangement as generallyused. 6^ is a galvanometer having two coils g g wound soas to produce, with equal currents, equal but oppositeeffects on the…
Telegraph · Telegraph lines
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