National Telegraphic Union · New York : N.T.U. · leaf 312
o the battery through the other wire of the relayand the rheostat. The relay wires 1, 3, and 7, 5, are nowtraversed by the double current equal to \ + \, but thewires 2, 4, and 6, 8, are each traversed only by the cur-rent of a single battery, leaving at A the force of £, and atB the force of ■ The… … Fig. 1.(* _l_ B)—n_ Thus each station receives its signal throughthe action of the distant battery only. A third position occurs where one of the keys, at B forinstance, is in the act of changing from the front contacta to the rear contact c, in which case the current fromA is interrupted at b and…
Telegraph
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