Theory and practice of the electric telegraph; a manual for operators and students (1875)
Churchill, Charles Henry, d. 1904. [from old catalog] · Oberlin, Ohio, Sherman & bros. · leaf 72
es hang between the strapsand have metallic connection with the binding screws, I, II,III, IV, V, VI, VII, at the side. The upright straps are allcut in two in the line x x* and joined again by pushing abrass peg between the ends. One is seen withdrawn at X. It may be seen by a slight inspection… … The Culgan Switch. E, C and F being opposite electrodes. At a way stationa switch with srxstraps and sevenhorizontal wireswould provide forthree through linesail three instru-in ments. VS. Wh.it would b3IV the method? Suppose th re ewires from the eastb~Kfl vt terminate in thebinding screws A,vn B,…
Telegraph
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