American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 309
se of a loop switch is to facilitate the * switching of loops and loopbatteries, worked in connection with duplex and quadruplex sets. Although the term **loop would signify an unbroken wire from the main officeto the branch office and return, and was and is so employed in such cases, it has… … LOOP SWITCH CONNECTIONS. In Fig. 200 a common form of loop switch and its connections are shown theorti-cally at l s. The wires, binding screws, plugs, or wedges, connections, etc., for one duplex or quad-ruplex loop, are outlined in the figure. The binding posts a, ^and/,/ areplaced on the back of…
Telegraph
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