The science and practice of photography : an elementary textbook on the scientific theory and a laboratory manual (1920)
Roebuck, John R. (John Ransom), 1876-1965 · New York ; London : D. Appleton and company · leaf 167
Fig. 17. Photographs of a narrow slit illuminated from be- hind with an arc light. Each image from left to right received 5 times the exposure of the preceding one. Series b was taken on an ordinary plate, and series a on a double coated plate. See Art. 77. Fig. 20. The image of a small very bright…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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