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 41
ection, and Fig. 21 a transverse section, of the whole apparatus. Figs. 22 to 24 are detail views. Fig. 22 shows the ratchet-wheel and pawl of the eccentric shaft; Fig. 23 a portion of the framed glass, and Fig. 24 a part of an axle, with Fig. 18. a wheel. The scale of is 1\ inches to a foot. Fig.… … The stand, with the FlG 19 rails, is placed close to a window. The rails extend out of the building, and are trussed to the wall. The stand is somewhat longer than twice the length of the board.
Photographic reproduction of plans, drawings, etc · Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
