American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 200
the utilization of the force of gravity; the main line relays R, r,being tilted, as shown in the diagram, for this purpose. Each relay is provided withan extra electro ma^^fnet, as shown, the local circuit of which is controlled by the oppo-site transmitter. Normally these local circuits are…
Telegraph
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