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Triumphs and wonders of the 19th century, the true mirror of a phenomenal era, a volume of original, entertaining and instructive historic and descriptive writings, showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress .. (1899)

Boyd, James Penny, 1836-1910 · Philadelphia, Pa., A. J. Holman & Co · leaf 37

An illustration from Triumphs and wonders of the 19th century, the true mirror of a phenomenal era, a volume of original, entertaining and instructive historic and descriptive writings, showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress .., 1899, leaf 37
ate messages over thesame wire, two in one direction andtwo in another. This was followed by cyrus ^v. field. the invention of Grays harmonic sys-tem, by means of which a number of messages greater than four are trans-mitted at the same time over the same wire; and this again by Delaneyssynchronous… … WONDERS OF ELECTRICITY 29 For a time successful telegraphy was limited to overland spaces, the conduct-ors or wires, consisting of iron or copper, being insulated where they passedthe supporting poles. In the cities, supporting poles proved to be unsightlyand dangerous, and they were succeeded by…

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