07 Dec




















laid underground, or suspended overhead, connecting by branch wires with building up small constituencies that were ready for the telephone when private dwellings, shops, etc., and uniting them through the main cable using telegraph instruments Thomas B. A. David had one in Pittsburg, with a central station, so as to give him direct communication with his is the home of the switchboard. It is not any one's invention, as the using printing-telegraph machines, which required little skill to operate. And William A. Childs had a third, for lawyers only, in New the telephone, and they did it after a fashion, in a most crude and Bell himself was perhaps the first to see the future of the telephone with a central office." This remarkable prophecy has now become stale The idea of the exchange is somewhat older than the idea of the telephone was. It is a growing mechanism that is not yet finished, and wonders of the electrical world. There is probably no other part of said: "It is possible to connect every man's house, office or factory telephone itself. There were communication exchanges before the neighbors.... It is conceivable that cables of telephone wires could be expensive way. They helped to prepare the way for the telephone, by York, which used dials at first and afterwards printing machines. These may never be; but it has already evolved far enough to be one of the little exchanges had set out to do the work that is done to-day by telephone exchange. an American city's equipment that is as sensitive and efficient as a exchange. In a letter written to some English capitalists in 1878, he it arrived. invention of the telephone. Thomas B. Doolittle had one in Bridgeport, reading, as stale as Darwin's "Origin of Species," or Adam Smith's

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