Instructions for testing telegraph lines and the technical arrangements of offices (1878)
Schwendler, Louis, 1838-1882 · London : Trèubner · leaf 136
ption.—In its elementary form DArlincourtsrelay may be represented as in Fig. 3. a 6 c c^ is a soft iron core in the shape of a horse shoe,cut out in the middle in a peculiar manner, as indicatedin the fioure. Each arm of the horse shoe carriesa helix of insulated wire, connected up successively… … axis, and moving freely in a horizontal plane. Thistongue is strongly polarised by being pivoted in closeproximity to one of the poles of a powerful permanentmagnet. The free end of the tongue (which in thefigure is indicated by s, the permanent magnet andthe pivoted part of the tongue are not…
Telegraph · Telegraph lines
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