The design and test of a new type of telephone repeating coil (1915)
Turner, Hubert Michael · leaf 12
ations ma.y be carried on c,t the same time over two pairs of wires. ihethird conversation is made possible by use of what is known asthe phantom circuit. xhis circuit is obtained by connectingthe leads from the third telephone to the mid-points of the re-peating coils in the metallic circuit, as… … Fig,. 19 In addition to the three conversations it is possible tosend simultaneously and without interference as many as eighttelegraph messages. Such a puadruplex system is used be-tween Hew York and Chicago. She repeating coil also makes possible the use of thecommon battery system. Discussion of…
Telephone · Electric coils · Theses
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