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Photolithograph :: Photolithograph (n.) A lithographic picture or copy from a stone prepared by the aid of photography.

Picture :: Picture (n.) A representation of anything (as a person, a landscape, a building) 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..

Photo- :: Photo- () A combining form from Gr. fw^s, fwto`s, light; as, photography, phototype, photometer..

Camera :: Camera (n.) A chamber, or instrument having a chamber. Specifically: The camera obscura when used in photography. See Camera, and Camera obscura..

Magnesium :: Magnesium (n.) A light silver-white metallic element, malleable and ductile, quite permanent in dry air but tarnishing in moist air. It burns, forming (the oxide) magnesia, with the production of a blinding light (the so-called magnesium light) which is used in signaling, in pyrotechny, or in photography where a strong actinic illuminant is required. Its compounds occur abundantly, as in dolomite, talc, meerschaum, etc. Symbol Mg. Atomic weight, 24.4. Specific gravity, 1.75..

Photography :: Photography (n.) The science which relates to the action of light on sensitive bodies in the production of pictures, the fixation of images, and the like..

Collodion :: Collodion (n.) A solution of pyroxylin (soluble gun cotton) in ether containing a varying proportion of alcohol. It is strongly adhesive, and is used by surgeons as a coating for wounds; but its chief application is as a vehicle for the sensitive film in photography..

Lithophotography :: Lithophotography (n.) Same as Photolithography.

Intensifier :: Intensifier (n.) One who or that which intensifies or strengthens; in photography, an agent used to intensify the lights or shadows of a picture..

Pyrogallol :: Pyrogallol (n.) A phenol metameric with phloroglucin, obtained by the distillation of gallic acid as a poisonous white crystalline substance having acid properties, and 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..

Actinism :: Actinism (n.) The property of radiant energy (found chiefly in solar or electric light) by which chemical changes are produced, as in photography..

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