Tunzelmann, George William von, 1856- · New York, Scribner & Welford · leaf 206
ly employed in the earlier exchanges. Themethod, however, is very inconvenient, owing to the con-fusion caused by operators calling to each other from allparts of the room, and the multiple switch-board, a com-paratively recent invention, is now gradually displacingall such systems. The general… … 190 ELECTRICITY IN MODERN LIFE. subscribers as she can conveniently serve, and the drop-shutters and annunciators belonging to these groups ofsubscribers are seen on the lower section of the board.Each subscriber to the exchange is connected to a groupof spring-jacks placed on the upper section of…
Electric industries · Electricity
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