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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..

Photochromy :: Photochromy (n.) The art or process of reproducing colors by photography.

Photochemistry :: Photochemistry (n.) The branch of chemistry which relates to the effect of light in producing chemical changes, as in photography..

Microphotography :: Microphotography (n.) The art of making microphotographs.

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

Emulsion :: Emulsion (n.) Any liquid preparation of a color and consistency resembling milk; as: (a) In pharmacy, an extract 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..

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..

Magnetograph :: Magnetograph (n.) An automatic instrument for registering, by photography or otherwise, the states and variations of any of the terrestrial magnetic elements..

Photograph :: Photograph (v. i.) To practice photography; to take photographs.

Chromophotography :: Chromophotography (n.) The art of producing photographs in colors.

Photoxylography :: Photoxylography (n.) The process of producing a representation of an object on wood, by photography, for the use of the wood engraver..

Heliography :: Heliography (n.) Photography.

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

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..

Spectrum :: Spectrum (n.) The several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and observed or studied either as spread out on a screen, by direct vision, by photography, or otherwise. See Illust. of Light, and Spectroscope..

Astrophotography :: Astrophotography (n.) The application of photography to the delineation of the sun, moon, and stars..

Photograph :: Photograph (v. t.) To take a picture or likeness of by means of photography; as, to photograph a view; to photograph a group..

Stereographic :: Stereograph (n.) Any picture, or pair of pictures, prepared for exhibition in the stereoscope. Stereographs are now commonly made by means of photography..

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..

Photograph :: Photograph (n.) A picture or likeness obtained by photography.

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