Modern practice of the electric telegraph : a handbook for electricians and operators (1874)
Pope, Frank L., 1840-1895 · New York : D. Van Nostrand · leaf 53
e-ment is found extremely useful in connecting batter-ies as well as instruments. At a way station it ispreferable to a simple cut-out, for the reason that theapparatus is entirely disconnected from the circuit whenthe wedge is withdrawn (59). 65. The Universal Switch, for the use of officeshaving… … ii. IIL IV. V. VI. VII. Fig. 22. the arrangement most generally used, which is knownas the Culgan Switch, from the name of its inventor.The upright straps of brass, A, B, C, D, E, F, are fixedupon a slab of hard wood, or other non-conducting ma-terial, and provided with binding screws at their…
Telegraph
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