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An apparatus in which the images of extermal 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 oulines may be traced.

A chamber, or instrument having a chamber. Specifically: The camera obscura when used in photography. See Camera, and Camera obscura. Bellows camera. See under Bellows. -- In camera (Law), in a judge's chamber, that is, privately; as, a judge hears testimony which is not fit for the open court in camera. -- Panoramic…

ges in a darkened room, usually called scioptic ball. Scioptic ball (Opt.), the lens of a camera obscura mounted in a wooden ball which fits a socket in a window shutter so as to be readily turned, like the eye, to different parts of the landscape.

a picture and reproducing its image as a positive or negative. The transmitter includes a camera obscura and a row of minute selenium cells. The receiver includes an oscillograph, ralay, equilibrator, and an induction coil the sparks from which perforate a paper with tiny holes that form the image.