Instructions for testing telegraph lines and the technical arrangements of offices (1878)
Schwendler, Louis, 1838-1882 · London : Trèubner · leaf 206
nd B, with short-circuiting stopper out, and contact closed at j). INSTRUMENTS AND CONNECTIONS. 193 Conduction :—Between A and B with sliort-circuitiuo; stopper in.Insulation:—Between A and B with the stopper outbut contact at p broken; and between A andcore of electro-magnet.Range:—Twenty-five… … :u.^ig3 Fig. 18. gives a vertical section of the apparatus.MM is a horse-shoe electro-magnet of the usual con-struction. N is the armature, and S the antagonisticspring, the tension on which can be adjusted by meansof the screw L. The ends of the wire of the electro-magnet are attached to two…
Telegraph · Telegraph lines
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