Instructions for testing telegraph lines and the technical arrangements of offices (1878)
Schwendler, Louis, 1838-1882 · London : Trèubner · leaf 169
sounder, 156 OFFICE TESTING. Fig. 11 gives the diagram of its principal adjustableparts, regardless of tlie actual mechanical constructionof the instrument. S, &, are the two limiting screws wliicli are madeadjustable. These screws are platinum tipped, as theyalso act as electrical contacts… … ® l-wmwwwwHjp of which can be regulated to requirements in the ordinarymanner. To the lever W, which turns on a horizontal axis (Z),is fixed the soft-iron armature ah, 711 is the electro-magnet, r is a small brass rivet placedin the middle of each iron core of the electro-mao;net.This rivet serves…
Telegraph · Telegraph lines
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