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Triumphs and wonders of the 19th century, a volume of original, historic and descriptive writings showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress (1901)

Boyd, James Penny, 1836-1910 · Philadelphia, A. J. Holman & co · leaf 43

An illustration from Triumphs and wonders of the 19th century, a volume of original, historic and descriptive writings showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress, 1901, leaf 43
A STRING TELEPHONE. quently. One of the earliest steps to-ward the evolution of the electric tele-phone was taken by Mr. Page, of Salem,.Mass., in 1837, who discovered that amagnetic bar could emit sounds whenrapidly magnetized and demagnetized;and that those sounds corresponded withthe number of…

Progress · Inventions

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