Instructions for testing telegraph lines and the technical arrangements of offices (1878)
Schwendler, Louis, 1838-1882 · London : Trèubner · leaf 204
xes into theebonite, square. INSTRUMENTS AND CONNECTIONS. 191 B wliicli is in permanent contact with the brass stand C.To C is connected, by two adjustable screws S, a springwhich is platinum tipped and presses against the plati-num tipped point of the armature, so that at _p a perfectcontact is… … distance. The terminals A and B can be short-circuitedby a plug. The armature a is prevented from touchingthe iron cores by the usual brass rivets fixed in thecentres of the cores. The distance between electro-magnet and armature can be roughly altered by thescrews /i, and finely by the screws /S.…
Telegraph · Telegraph lines
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