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Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)

D. Appleton and Company · New York : D. Appleton and Co. · leaf 703

An illustration from Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes, 1873, leaf 703 — and the portion of iron ■lissolved unites wiihtlie prussiate of potash to form the color known as Prussiau blue, •which permanently stains or dyes*the paper. A modification in the mode of marking has been introduced in this telegraph bj llr. Rogers, of Bal-timore. He substitutes a pen carrying an… … In Bains telegraph, no receiving magnet is necessary. The current traversing tlie long wires is suffi-cient to leave its trace upon the paper. There would be a disadvantage, however, in tiie use of thistelegraph, with a simple circuit, where it is desirable to register the same communication at a…

Mechanical engineering · Mechanics · Engineering

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