Instructions for testing telegraph lines and the technical arrangements of offices (1878)
Schwendler, Louis, 1838-1882 · London : Trèubner · leaf 222
and theother the battery room. Care is to he taken that all the ^mnts of the leading INSTRUMENTS AND CONNECTIONS. 209 wires from the earth-plate to the office are perfectly in-sulated from the ground. The earth wire has to pass (supported on the usualwooden brackets) close to the different… … The joints are to be made as follows : Make a circular cut with a sharp penknife throughthe whole of the India rubber, and then with another cutfollow for about two inches the visible spiral in whichthe India rubber is laid on, and unwind the spiral. Let * This is necessary in order to secure tlie…
Telegraph · Telegraph lines
Internet Archive · Northeastern University Library · Public Domain Mark 1.0. Free to use for anything.
