Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . of reticulations, which, iu theirsize and , were somewhat proportionate to the actinicactivity of the light This made a kind of grain, which wascopiedbv electro-deposition, forming an intiigho printing sur-face whit-h held the ink in its fine lines. He subsequently ap-plied the same principle to the production of relief plates, forwhich he obtained an E
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . of reticulations, which, iu theirsize and , were somewhat proportionate to the actinicactivity of the light This made a kind of grain, which wascopiedbv electro-deposition, forming an intiigho printing sur-face whit-h held the ink in its fine lines. He subsequently ap-plied the same principle to the production of relief plates, forwhich he obtained an English piitent, about 1^55. He wasprobablv the only man who ever attempted to obtain by photo-graphic means a relief plate for the type-press direct from na-ture- See \ph. Duncas Dallas, about 1862, is believed to have operated insubstantially the same way, but with better success. KglofF^tein, in New York, worked a process hased upon theFox THlbot method. EidUtz e^stablished the Phototype Com-pany of New York, and his efforts were nearly identical withPretsch, excepting, perhaps, that he successfully threw dowaa deposit of copper on the swelled and still moist gelatiue. Photo-li-thogra-phy. A mode »f producing. = I < I - P PHOTOLITHOGEAPHY. 1687 PHOTOMETER. by photogiaphic means designs upon stone, fromwhich impressions ma^^ be obtained in the ordinarylithographic press. Indications of efforts in this direction may be credited to thelate Joseph Dixon of Jersey <-ity, and to Lewis of Dublin, about1841. Dixons attempt was analo-^ous to Poiterins process, asdescribed hereafter, and Lewiss was an iujreuious modificationof the dagufireotype process, in which a thin surface of silverapplied to an underlying resinous coating whs so treated sub-sequent to the photographic image being produced thereon, byexposure to lii^iit and mercurial fumes, as to lay bare portionsof the greasy or resinous matter, which was then susceptibleof transfer. No specimens or contempora
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