Instructions for testing telegraph lines and the technical arrangements of offices (1878)
Schwendler, Louis, 1838-1882 · London : Trèubner · leaf 222
d when the insulation is low. FAULT TESTING. 207 ^d Case.—There is a good wire available in additionto the two wires that are in contact with one another.Loop the good wire with one of the faulty wires at thedistant station, and insulate the other faulty wire. Con-nect the o-ood wire to the… … Then at balance a ij = h {iv -\- X)and by a loop test we can find aW—biu When ~ a + ba = b W-w (76) 2o8 LINE TESTING. Substituting the value of x for iv in formulae (39) and(40), we liave y?= 2 y^ ... ... Kin when the wire is of the same gauge throughout the line ; and when there are several gauges…
Telegraph · Telegraph lines
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