Modern heliographic processes : a manual of instruction in the art of reproducing drawings, engravings, manuscripts, etc., by the action of light : for the use of engineers, architects, draughtsmen, artists, and scientists (1888)
Lietze, Ernst · New York : Van Nostrand · leaf 44
States patent No. 263,242). An advantage of the vacuum printing frame is, that the glass plate will not be strained, since the atmosphere presses equally on both sides of the glass, and, therefore, thinner glass plates may be used. In Figs. 25 to 32, we illustrate the Pneumatic Heliographic Print-… … Figs. 25, 26, 27 and 28.
Photographic reproduction of plans, drawings, etc · Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
