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Camera Obscura

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Webster Dictionary
• Camera Obscura
Encyclopedias
1911 Encyclopedia Britannica
• Camera Obscura
The Nuttall Encyclopedia
• Camera Obscura

(1):

An apparatus in which the images of external objects, formed by a convex lens or a concave mirror, are thrown on a paper or other white surface placed in the focus of the lens or mirror within a darkened chamber, or box, so that the outlines may be traced.

(2):

An apparatus in which the image of an external object or objects is, by means of lenses, thrown upon a sensitized plate or surface placed at the back of an extensible darkened box or chamber variously modified; - commonly called simply the camera.