Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 79
to operate at the instant this armature leaves thisfront contact. Also, that with the home key closed,(3) the home sounder will operate as soon as the distantpole-changer armature leaves its rear contact and (4) willremain actuated until this armature again touches its rearcontact. Thus, conditions… … Fig. 14. is for the purpose of quickening transmission for the slowconditions (i) and (4). When both keys are open the negative generator termi-nals touch armatures y and y^ of the pole-changers and nocurrent traverses the Hne, Hne coils of both relays, or re-sistances g and j. Currents, however,…
Telegraph
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