First edition. Describes the collotype process, a photo- mechanical method of printing with ink from the plane surface of a photographic film. May be used for the same purposes for which the half-tone process, photogravure and lithography are used. With the bookplate and signature in pencil of Gavin Bridson. Ex library from The Chemists Club of New York with markings. Scarce. viii, 96 pages. cloth.. tall 12mo...