American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 105
metal plug which is inserted between the contact points of the ordinaryMorse key. Flexible insulated wires connect the plug with the binding- posts of thetransmitter. In order that the noise incidental to the operation of the typewriter should notinterfere with the reception of the Morse signals by… … SOUNDER RESONATOR. desired by the operator. The device consists of a resonating box, suspended by anadjustable support, and within which the sounder is placed. The local circuit is con-ducted to the sounder by flexible wires shown. This arrangement, it is obvious, may also SWITCH BOARDS. ]] be…
Telegraph
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