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 88
tched. The plate has to be made warm on one side and then be changed to the other. In small ovens it is impossible to get an even heat over the entire plate, which is absolutely necessary. In the larger-sized furnaces a greater amount of gas is consumed, but the superiority of them over the smaller… … Fig. 84 the heat. The top of the furnace can be covered with a sheet of tin plate if desired. Two inches above the heaters and across the furnace wires are suspended by cross-pieces. Upon
Photoengraving
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
