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Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
hoto-zin-cog′ra-phy. A process for the production of delineations on zinc by the aid of light, from which impressions can be printed after the manner of zincography. This method of producing and printing facsimiles is identical with photolithography, save in the fact that zinc plates are substituted for stone. Cutting and Bradford, as well as Osborne, contemplated the production of the printable picture on zinc, as well as on stone; the latter produced copies of maps in this way in March, 1860. To Col. Sir Henry James, however, the credit is due of giving to a process on zinc, elaborated by the employees of the Southampton Map Office, considerable prominence and importance. This process resembles Asser's, but only to the extent that a transfer is employed. In its details it is identical with Osborne's (omitting the use of albumen). Both these inventors anticipated James, and published elaborate descriptions of their processes. The Southampton office has made a very useful