National Telegraphic Union · New York : N.T.U. · leaf 300
e left side of the key. The front con-tact a of the right side of the key is connected to one poleof the main battery, B, the other pole being to the ground.The back contact, c, is connected direct to the ground,while the middle connection or key lever, &, is connectedthrough the second wire of… … line to B, where it passes from 3 through the relay to 4and key 6 c, and thence through the earth to the batteryat station A. At the same instant the current of the equating batterypasses through a b, I, and the second wire of the relaycoils and returns through II, to the batterv. If now the key at…
Telegraph
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