SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Photomechanical prints, 19th-century artwork. This term refers to any method that produces a photographic print using machines, rather than by hand. Such methods were developed in the late 19th century. At top is the impression chamber, where lights within the chamber (black) shine through a photographic plate or negative to produce a latent image on the photographic paper (white). At bottom is the developing chamber where chemicals are used to make the latent image visible. Artwork from the 17th volume (first period of 1896) of the French popular science weekly 'La Science Illustree'.
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