Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 892
Underground Telegraph Lines.—A valuable report on this subject was made in 1879 to the Chi-cago City Council, by Mr. J. P. Barrett, superintendent of the city telegraph system, from which thefollowing facts are taken: The principal portion of the telegraph wires in the leading cities of Europe are…
Mechanical engineering -- Dictionaries
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