American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 111
pinin the corresponding aperture, a, between the two vertical bars at the lower end of theboard. The vertical row of binding posts on the right are connected behind theboard to the notched discs, as shown by the dotted lines. 82 AMERICAN TELEGRAPHY. Many different combinations will suggest… … WAY OFFICE SWITCH. ly done, if the line wires are arranged as in Fig. 62. By the use of split plugs sp, the testing instrument, or any of the instru- SWITCH BOARDS. 83 ments connected with one of the phigs, may be readly cut in on any of tlie wires.One such plug is shown cut in on wire 5, thereby…
Telegraph
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