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Knight's Mechanical Encyclopedia (ed. Knight) 2 0 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
t proportionate to the actinic activity of the light. This made a kind of grain, which was copied by electro-deposition, forming an intaglio printing surface which held the ink in its fine lines. He subsequently applied the same principle to the production of relief plates, for which he obtained an English patent, about 1855. He was probably the only man who ever attempted to obtain by photographic means a relief plate for the type-press direct from nature. See Photogalvanograph. Duncas Dallas, about 1862, is believed to have operated in substantially the same way, but with better success. Egloffstein, in New York, worked a process based upon the Fox Talbot method. Eidlitz established the Phototype Company of New York, and his efforts were nearly identical with Pretsch, excepting, perhaps, that he successfully threw down a deposit of copper on the swelled and still moist gelatine. Photo-li-thogra-phy. A mode of producing by photographic means designs upon stone, fr