Modern practice of the electric telegraph : a handbook for electricians and operators (1874)
Pope, Frank L., 1840-1895 · New York : D. Van Nostrand · leaf 55
heswitch for other purposes. 68. Jones Lock Switch is employed for the samepurposes, and connected in the same manner as the one 42 MODERN PRACTICE OF THE ELECTRIC TELEGRAPH. last described, but the connection between the verticaland horizontal wires is made by a metallic peg, providedwith a… … Fig. 23. It is also cheaper and much more compact; a matter ofsome importance in arranging for the accommodation ofa large number of wires. 69. There are other forms of switches designed forspecial purposes, which it is unnecessary to describe ina work of this kind. Those already referred to are…
Telegraph
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
