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40.1 x 31.2 cm ⏐ 15.8 x 12.3 in (300dpi)
ANN RONAN PICTURE LIBRARY / HERITAGE IMAGES / SCIENCE PHOTO LIBRARY ANN RONAN PICTURE LIBRARY / HERITAGE IMAGES / SCIENCE PHOTO LIBRARY
Seaside visitors paying a visit to the camera obscura, 1862. The viewers sat in a darkened chamber: the scene around was collected by the mirror (A) and passed through a convex lens (B), and thrown onto a white table at (C). From The Boy's Playbook of Science by JH Pepper.
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