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 897
which is easily done, the apparatus will work for a long time withoutreadjustment. The best results have been obtained with powder com-posed of a mixture of carbon or plumbago and silver. The principle of the telephones above described is the same as that of the Micnorno.NE, which see. III. The…
Mechanical engineering -- Dictionaries
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