camera (kam'er-ah)

A chamber. See also camara. c. lucid a. An apparatus for drawing microscopic objects by projecting their images upon a sheet of paper and tracing the outlines thus depicted with a pencil. It is attached to the ocular of the microscope and usually consists of a combination of right-angled prisms and a mirror, c. medullar is. See centrum ovale, under centrum, c. obscura. An apparatus invented by Porta for obtaining pictures of objects. It consists e entially of a box with a small opening closed by a convex lens. The rays from the object, striking upon the lens, are brought to a focus on a plate of ground gla , either directly or after reflection from a mirror. Here the image can either be traced by hand, or, if a sensitive plate is introduced, photographed. camerae oculi. See anterior and posterior chamber of the eye, under chamber, c. oculi tertia. See canal of Petit, under canal, c. sept i lucid i. The fifth ventricle of the brain. photographic c. A c. oscura especially adapted to photography. It consists of a box fitted for the introduction of a sensitive plate designed to receive the image, and provided with a telescopic slide for bringing the rays pa ing through the lens to a focus on the plate. [Lat., "a chamber."]