Instructions for testing telegraph lines and the technical arrangements of offices (1878)
Schwendler, Louis, 1838-1882 · London : Trèubner · leaf 200
electrum, well hammered,gives very constant springs of any strength and shape. J.YSTRUMENTS AND CONNECTIONS. 187 instrument-l3ar is connected with the lever of a key. Inorder to be able to branch off the leading wires to thekeys on both sides of the commutator, which is requiredfor the sake of… … the instrument ea^^th is to be connected. Although thedifferent modes of connecting up a commutator can beeasily understood from the diagram, for clearness sake afew examples may be given :— 188 OFFICE TESTING. Working the lines in S and T. In this case no stop-per is to be left in the holes h and…
Telegraph · Telegraph lines
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