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 594
a conduct-ing cord, and at the same time movesa switch, which connects her tele-phone to his line. She inquires whatconnection is desired, makes it byinserting the plug at the other endof the conducting cord in thespring jack belonging to the line ofthe desired subscriber, and calls him by pushing… … 384. — Telephone springjack. 530 ELECTRICITY AND MAGNETISM magneto crank, which causes a special drop to fall in theexchange and calls the operators attention to the fact that thelines may be disconnected. Boards of this general type (Fig. 385) are used only in smallexchanges. On large boards tiny…
Electricity · Magnetism
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
