Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 270
ost always a very large number of lines connectingwith a common switchboard, they are generally very com-plicated. Fig. 120 shows asimple ten-lineswitchoard; As maybe seen, the switch-board consists of twodistinct parts, one thevertical board with aseries of drop shut-ters or drops, and aseries of… … Fig. 120. The jack and plug 218. The jack is an (see A fig. 121) arrangement, bymeans of which, the connection of two subscribers may bemade, by inserting the plug B into its aperture, so that itcomes into contact with the line by touching the spring a.The forward end of the spring a, rests in its…
Electrical engineering
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