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A telescope adapted for taking photographs of the heavenly bodies.

An arrangement of two photographic cameras, the plates of which may be brought into exactly the same plane, used in surveying and map making. From the differences between two pictures taken at the same moment, measurements in all dimensions of the region may be obtained.

A plate or block with a printing surface (usually in relief) obtained from a photograph; also, any one of the many methods of processes by which such a printing surface is obtained.

The process of producing a representation of an object on wood, by photography, for the use of the wood engraver.

A process, analogous to photolithography, for reproducing photographed impressions transferred to zinc plate.

upon canvas, paper, or other surface, produced by means of painting, drawing, engraving, photography, etc.; a representation in colors. By extension, a figure; a model. Pictures and shapes are but secondary objects. Bacon. The young king's picture . . . in virgin wax. Howell.

A size of photograph a little larger than a postage stamp.

A permanent photographic picture or print in platinum black.

A photographic copy, or positive picture, on prepared paper, as from a negative, or from a drawing on transparent paper.

ng typesetting and presswork, with their adjuncts; typography; also, the act of producing photographic prints. Block printing. See under Block. -- Printing frame (Photog.), a shallow box, usually having a glass front, in which prints are made by exposure to light. -- Printing house, a printing office. -- Printing in…

which cloud effects or other features not in the original negative are introduced into a photograph. Portions, such as the sky, are covered while printing and the blank space thus reserved is filled in by printing from another negative.

A very slow photographic plate, giving good contrasts between high lights and shadows, used esp. for making lantern slides.

hence called also pyrogallic acid. It is a strong reducer, and is used as a developer in photography and in the production of certain dyes.

A picture produced by the Röntgen rays upon a sensitive surface, photographic or fluorescent, especially a picture of opaque objects traversed by the rays.

rays, and gamma rays (see these terms). By reason of these rays they ionize gases, affect photographic plates, cause sores on the skin, and produce many other striking effects. Their degree of activity depends on the proportion of radium present, but not on its state of chemical combination or on external conditions.Th…

al discharge. It is capable of passing through many bodies opaque to light, and producing photographic and fluorescent effects by which means pictures showing the internal structure of opaque objects are made, called radiographs, or sciagraphs. So called from the discoverer, W. C. Röntgen. -- X ray, the Röntgen ray; -…

A system of lines forming small squares of standard size, which is photographed, by a separate exposure, on the same plate with star images to facilitate measurements, detect changes of the film, etc.

noted for their penetration of many opaque substances, as wood and flesh, their action on photographic plates, and their fluorescent effects. They were called X rays by their discoverer, W. K. Röntgen. They also ionize gases, but cannot be reflected, or polarized, or deflected by a magnetic field. They are regarded as…

A photograph printed by a process in which a strip or roll of sensitized paper is automatically fed over the negative so that a series of prints are made, and are then developed, fixed, cut apart, and washed at a very rapid rate.

o be misinterpretations of ordinary phenomena, illusions or imaginary objects. Fraudulent photographs purporting to show flying saucers are published from time to time.