What is "photozincography"

Photozincography \Pho`to*zin*cog"ra*phy\, n. [Photo- + zincography.] A process, analogous to photolithography, for reproducing photographed impressions transferred to zinc plate.

n. A form of photolithography using a zinc plate

Photozincography, sometimes referred to as Heliozincography but essentially the same process, known commercially as zinco, is the photographic process developed by Sir Henry James FRS (1803–1877) in the mid-nineteenth century.

This method enabled the accurate reproduction of images, manuscript text and outline engravings, which proved invaluable when originally used to create maps during the Ordnance Survey of Great Britain during the 1850s, carried out by the government's Topographical Department, headed by Colonel Sir Henry James.