Recent Developments in Telegraphy and Telephony 1


    For many years the simple form of Morse apparatus or its equivalents served the requirements of “most countries, but as the telegraph service grew and the traffic rendered it imperative to erect long lines directly connecting, distant cities, the problem of obtaining “a greater revenue from the large capital expenditure involved became pressing, and progress was made broadly on three distinct lines of development. In the first, means were designed for the transmission of several messages simultaneously over the same conductor; in the second, by the use of suitable mechanical and electrical devices, the actual speed of transmission was raised in overhead wires to ten or twelve times that possible by manual operating, and, finally, type printing and writing systems were invented with varying degrees of success.

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    Recent Developments in Telegraphy and Telephony 1 . Nature 83, 542–544 (1910).

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