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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 45

An illustration from 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, leaf 45
ced upon the glass. The rubber cover F has two beads extending around one side, near the edges, and is fastened to a second frame. This second frame fits loosely into the opening of the main frame K, to which it is hinged, and can be pressed lightly against the glass plate by means of the swivels… … Figs. 29 and 32. nects the space, be- tween the rubber cover F and the glass plate, with an air-pump, which is shown in detail in Figs. 30 and 31, and which is fastened to the frame K, and also serves as a handle for the frame. (See Figs. 25 and 29.) After the air in the frame has been rarefied by…

Photographic reproduction of plans, drawings, etc · Photography

Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.

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