An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 596
have spring jacksin her section, she can connect any of her subscriberslines to the line of any other subscriber which enters theexchange. Figure 386 shows the principle of the multiple board. Thedots marked local jacks in each section represent the springjacks belonging to the lines which are… … SECTION NO. SECTION NO. 3 SECTION NO. 2 EXCHANGE Fig. 386. — Diagram of multiple switchboard. 532 ELECTRICITY AND MAGNETISM the figure for the sake of simplicity. The dots marked ordi-nary jacks represent the multiple spring jacks, by means ofwhich the operator may connect any one of her…
Electricity · Magnetism
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