Instructions for testing telegraph lines and the technical arrangements of offices (1878)
Schwendler, Louis, 1838-1882 · London : Trèubner · leaf 251
ORS. 235 <•A •pa^oaCsa; Q Id g S ho K a <1 ^ 1 Q+ fq 0 .5 K ^S3 .B 13 1 1 0 5 1 1 S2 0 0 0 ^1^ APPENDIX XII. APPARATUS FOR DETECTING DEFECTIVE JOINTSAND INSULATORS. The following is a simple and practical method of detecting electri-cally defective insulators in Telegraph Lines. The ]mnciple… … ^ From the accompanying diagram the connections of the apparatus•will be readily understood, / is the coil of a magneto-electric machine,the terminals of which, A and B, are carefully insulated with ebonitefrom each other and from the ground. Terminal B is in permanentcontact with the insulator…
Telegraph · Telegraph lines
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