American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 113
d. On one end ofthe strap a short pin p is attached. A similar pin /^ is set in the base board.At rest, the tension given to the strap brings/ snugly against/^ The s])lit j.hig 84 AMERICAN TELEGRAPHY. p, shown separately in Fig. 65, is grooved on its sides to fit the pins //^, andit is capable of… … SQUARE SPLIT PLUG. The line wire is brought to two binding posts lw lw^, on the base board, lw-is connected under the base to the strap s. lw to the pin/^. Thus when the plugis inserted between the 23ins,the office instrument, or relay, is put in the line wirecircuit. When the plug is withdrawn the…
Telegraph
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