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 80
tcontact. 4th. Wipe off all moisture or dirt about the circuit closerwhich might cause partial connection when the circuit isopen and make the key stick. 3. The Relay. 1. What directions for the relaj ? ist. Examine the platinum points, as for the key, andremove corrosion with a very fine file used… … Relay. In many instruments the adjustment is made by movingthe cores of the magnet as in the figure. 3d. In rainy or very changeable weather it is necessaryto attend to this adjustment with the nicest care and obser-vation, separating the cores from the armature, or the oppo-site, to make sure…
Telegraph
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