This book is a history of Photogalvanography by Pretsch, with full instructions and contemporary uses as well as discussion of other modifications, such as Mariot’s. Two samples of Mariot’s process, one a photogravure plate produced in 1869 and a photogravure portrait of Pretsch, 2 Photogalvanographs from Pretsch plates, one intaglio, one relief (both art), 2 Mariot Photo-Galvanogravures, one of scenery from 1869, one a map, 3 half-tones by Husnik, one from art, 2 from life. [1]