Instructions for testing telegraph lines and the technical arrangements of offices (1878)
Schwendler, Louis, 1838-1882 · London : Trèubner · leaf 18
oubt left in my mind thatthe progress of Telegraphy in every country will dependto a very great extent on the initiation of a quantitativetest system. If testing be executed in the true physicalspirit, it will never interfere with traffic, but will increaseits efficiency. This is not an assumption,… … This instrument has three separate deflecting coils, viz.,the brass ring, marked in fig. 1 (^^). This ring issimply cut open, and the two ends are brought in con-tact with the terminals S3 and S4. The resistance ofthe brass ring is nil. It can only be used as the deflect-ing coil when the current…
Telegraph · Telegraph lines
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