Atkinson, Philip. [from old catalog] · New York, The Century co. · leaf 228
current from Bs batteryflows equally through both branches of the relay at B,neutralizing the magnetism, and therefore releasing thearmature and producing an up click in the connectedsounder. But the current from B flowing in throughthe line branch of the relay at A, its armature is stillheld… … 206 ELECTRICITY FOR EVERYBODY. Hence it will be seen that each sounder responds tothe manipulation of the key at the opposite station, as insingle transmission, but is unaffected by the manipula-tion of the key at the home station; so that there can besimultaneous transmission in opposite…
Electricity
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