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An instrument for measuring the intensity of the photogenic (light-producing) rays, and computing the power of object glasses.

xtract of seeds, or a mixture of oil and water united by a mucilaginous substance. (b) In photography, a liquid preparation of collodion holding salt of silver, used in the photographic process.

ll shining spots on the surface of the sun which are brighter than the other parts of the photosphere. They are generally seen in the neighborhood of the dark spots, and are supposed to be elevated portions of the photosphere. Newcomb.

A photographic picture taken on an iron plate by a collodion process; -- familiarly called tintype.

(Photog.) An assisting instrument for focusing an object in or before a camera. Knight.

C6H2(HO)3.CO2H, with an astringent taste, and is a strong reducing agent, as employed in photography. It is usually prepared from tannin, and both give a dark color with iron salts, forming tannate and gallate of iron, which are the essential ingredients of common black ink.

fying something written, a writing; also, a writer; as autograph, crystograph, telegraph, photograph.

A kind of photograph.

An optical instrument for magnifying engravings, photographs, etc., usually having one large lens and two smaller ones.

An intermediate or middle tone in a painting, engraving, photograph, etc.; a middle tint, neither very dark nor very light.

Having, consisting of, or pertaining to, half tones; specif. (Photo-engraving),

A photograph in colors. R. Hunt.

The art of producing photographs in color.

A picture taken by heliography; a photograph.

Photography. R. Hunt.

The process of photographic engraving.

A method of transferring pictures from photographic negatives to hardened gelatin plates from which impressions are produced on paper as by lithography.

A photographic picture copied from the negative on glass; a photographic transparency. R. Hunt.

d or reflected to corresponding points in such focus; this may be received on a screen, a photographic plate, or the retina of the eye, and viewed directly by the eye, or with an eyeglass, as in the telescope and microscope; the likeness of an object formed by reflection; as, to see one's image in a mirror. Electrical…

Anything of unusual size or excellence, as a large decanter, a kind of large photograph, a large sheet of drowing, printing, or writing paper, etc.