The grammar of photo-engraving : containing instruction in drawing, chemistry and optics, as applied to photo-engraving, and a practical treatise on the art of half-tone, zinc etching, swelled gelatine, lithotype and chalk plate engraving, as practiced in the United States (1895)
Farquhar, H. D. (Harry D.), Eder, Josef Maria, 1855-1944 · London : Dawbard & Ward · leaf 90
85 THE GRAMMAR OF PHOTO-ENGRAVING. The frame, fig. 36, is the best in use, being heavily con- structed and having one inch plate glass and wood screens. … Fig. 36 The pressure is applied by iron thumb-screws that press against the top board, which is covered with heavy sheet iron. Callipers. The best of zinc has low places and small holes on its sur- face caused from dirt falling on the zinc when rolling. These have to be punched level with the face…
Photoengraving
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
