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Scientific American, Vol. 60, No. 13 (March 1889) (1889)

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An illustration from Scientific American, Vol. 60, No. 13 (March 1889), 1889, leaf 0
where the switchboard is placed. The ends of the street ca- bles are opened, and the pairs of wires are kept separate, and, by testing with a bell and battery, are traced to their out-door terminals. Each pair is numbered, and con- nected through the box with corre- JHIhi sponding binding screws.… … Fig. 4.-NEW CENTRAL STATION OF THE METROPOLITAN TELEPHONE CO., N. Y.-THE GENERAL EXCHANGE. ©1889 SCIENTIFIC AMERICAN, INC.

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