This section is from the book "Complete Self-Instructing Library Of Practical Photography", by J. B. Schriever. Also available from Amazon: Complete Self-Instructing Library Of Practical Photography.
A box form of camera arranged to hold a dozen plates. A plate is brought into focal position by means of a button or release. After exposure the plate drops forward and falls to the bottom of the camera box, while another plate is brought into position for the next exposure.
A multiplying camera is one so constructed that it is possible to make on one 5x7 plate, either four, nine, twelve, sixteen, twenty, thirty or forty-two exposures, as well as full cabinets. Generally known as a penny picture camera.
A dark chamber in which a ray of light is admitted by means of a small hole or lens. Figures of objects passing outside are projected onto a mirror which is placed at an angle of 45 degrees, and which, in turn, reflects the objects onto a white screen. If the mirror were not used the objects would be inverted.
A camera attached to the microscope for photographing microscopic objects. (See Photo-micrography.)
A camera in which a mirror is employed to throw a full-size image on a ground-glass at the top of the camera. thus enabling focusing to be done up to within an instant of making the exposure. The mirror is thrown out of position immediately preceding the exposure by the operation of pressing the button, which also releases the shutter.
A double camera fitted with two lenses, the centers of which are about 3 1/4 inches apart. The focal lengths of the lenses are equal. The size of the image projected by each lens is usually about 3 1/4 inches square.
(See Camera, Portrait.)
A table or support arranged to hold the camera.
C9H16CO. Gum camphor. White, translucent masses with numerous cracks; easily broken but difficult to powder. Soluble in alcohol, ether, chloroform, benzene; slightly soluble in water. Used in certain varnishes; sometimes added to gelatin, albumen, etc., to prevent decomposition. A small piece of camphor added to kerosene oil in a lamp increases the whiteness of the flame.
(See Balsam, Canada.)
The illuminating power of a sperm candle burning at the rate of 120 grains per hour.
Albumen or glossy prints as well as others are mounted on canvas for convenience in carrying, as they can then be handled quite carelessly without fear of being torn. The canvas should be sprinkled with water and then stretched upon a wooden frame, when the prints can be easily mounted by the use of any good starch paste. Ready prepared mounting canvas with paper on one side can be procured from regular dealers.