Instructions for testing telegraph lines and the technical arrangements of offices (1878)
Schwendler, Louis, 1838-1882 · London : Trèubner · leaf 155
rging itself. This fault has been eliminated byconnecting the tongue to the body of the key. 142 OFFICE TESTING. D. Further, D, the discharging relay, is connectedup in such a manner that the local current which passesthrouMi D when contact 4 is closed, exerts a force onthe tongue of D of the same… … and acts only for limiting the play of the tongue. It isessential to notice that the relay tongue of D is con-nected with the body of the key, and not with its rest-contact, as was the case in the former dischareino;arrangement. Now, suppose that a signal is sent intothe line. At the beginning of…
Telegraph · Telegraph lines
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