American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 267
lay, and a somewhat new form of transmitter tin which the supports and lever are of tubular brass is now employed. The local con-nections are shown by the letters II. p c is the dynamo pole-changer. The leak boxL B is shown with the arrangements for varying the ratio from i to 3 to i to 4 or… … TERMINAL CONNECTIONS WESTERN UNION QUADRUPLEX. J^IE QUADRUPLEX. 225 pin plugs between the discs on the end of ihe box, or by removing them. In the fig-ure a plug is inserted cutting out 600 ohms of the added resistance. No plug is in-serted in the leak, hence the box is arranged for the ratio of 3…
Telegraph
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