Theory and practice of the electric telegraph; a manual for operators and students (1875)
Churchill, Charles Henry, d. 1904. [from old catalog] · Oberlin, Ohio, Sherman & bros. · leaf 116
per resistance how i» the fault located? There are two cases. First suppose the two lines, whenboth are perfect, to be of equal resistance. First ascertain theresistance of the loop as in question four. Next put the neg-ative wire to the ground as in tig. 49. The current as before will pass from B… … B, the wires which cross at K not touching each other. Re-sistance enough is put into the faulty wire by means of therheostat it to make the needle balance. Tins resistance must 9 6 MANUAL OF TELEGRAPHY. of course equal that of the small part of the loop from Fthrough S to D. The points D and F…
Telegraph
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