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Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)

New York, Appleton · leaf 707

An illustration from Appleton's dictionary of machines, mechanics, engine-work, and engineering, 1869, leaf 707 — the portion of iron dissolved unites withi:e prussiate of potash to form the color known as Prussian blue, Avhich permanently stains or dyesthe paper. A modification in the mode of marking has been introduced in this telegraph by Mr. Rogers, of Bal-timore. He substitutes a pen carrying an ink which… … In Bains telegraph, no receiving magnet is necessary. The current traversing the long wires is suffi-cient to leave its trace upon the paper. There would be a disadvantage, however, in the use of thistelegraph, with a simple circuit, where it is desirable to register the same communication at a…

Mechanical engineering

Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.

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