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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 271

An illustration from Henry and Hora's modern electricity; a practical working encyclopedia, 1915, leaf 271 — Fig. 121. to the ground. When the plug is inserted into the apertureof the jack, it disconnects the line from the ground bylifting the spring a from the pin b and establishes a con-nection of the other line to the jack where another plug,connected with the former by a flexible cord dt is also… … \-c The drop 219. The drop(see fig. 122) isan apparatus in-d tended to attractthe attention ofthe operatorwhen a subscrib-er wishes a con-nection. The electromagnet a, is mounted on the backof the switchboards front plate , in which an aperture ELECTRICAL ENGINEERING 269 has been left, to allow a…

Electrical engineering

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