Camera obscura
The Optical Dictionary · 1904 · p. 4
An apparatus by means of which the images of external objects received through a convex lens are reproduced on a white surface at the focus of the lens.
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Everybody's Encyclopedia (1912)
Nuttall Encyclopedia (1907)
Chandler's Encyclopedia (1898)
Phrases and Names Their Origins and Meanings (1896)
An Illustrated Dictionary of Words Used In Art and Archealogy. (1883)
Zell's Condensed Dictionary (1879)
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