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Discoveries and inventions of the nineteenth century (1905)

Routledge, Robert · London : G. Routledge and Sons · leaf 640

An illustration from Discoveries and inventions of the nineteenth century, 1905, leaf 640 — Associationby Sir William Thomson, who pronounced it the wonder of wonders.For the first time in England, the instrument in a still simpler form wasexhibited by Mr. Preece, at the Plymouth meeting of the British Associ-ation in 1877, and of nearly the same construction as is still often… … Fig. 302^.—BeWs Speaking Telephone. THE TELEPHONE. 589 which transmitter and receiver are identical, each consistinjr externally ofa small cylindrical wooden or ebonite box, and with a handle three or fourinches in length of the same material. Fig. 302^/ is a section of the instru-ment where N S is…

Inventions

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