Instructions for testing telegraph lines and the technical arrangements of offices (1878)
Schwendler, Louis, 1838-1882 · London : Trèubner · leaf 44
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… … inserting plugs at p and p ; they merely serve to carryoff current from the coils, and have in themselves noaction on the needle. w is a comparison coil similar to that used in Wheat- stones Bridge. 30 ELECTRICAL TESTING. X is tlie unknown resistance to be measured.E is the electromotive force of…
Telegraph · Telegraph lines
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