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

A whitish soluble powder used as a developer in photography. Chemically, it is the sulphate of methyl-p-amino-m-cresol.

A salt of nitric acid. Nitrate of silver, a white crystalline salt (AgNO3), used in photography and as a cauterizing agent; -- called also lunar caustic.

A combining form from Gr. fw^s, fwto`s, light; as, photography, phototype, photometer.

An electrometer registering by photography.

of chemistry which relates to the effect of light in producing chemical changes, as in photography.

The art or process of reproducing colors by photography.

See Photography. [Obsoles.]

A method of surveying or map making by photography, used also in determining the height and motions of clouds, sea waves, and the like.

A picture or likeness obtained by photography.

One who practices, or is skilled in, photography.

Of or pertaining to photography; obtained by photography; used ib photography; as a photographic picture; a photographic camera. -- Pho`to*graph"ic*al*ly, adv. Photographic printing, the process of obtaining pictures, as on chemically prepared paper, from photographic negatives, by exposure to light.…

A double-lens instrument for measuring slight variations of the sun's diameter by photography, utilizing the common chord of two overlapping images.

A lithographic picture or copy from a stone prepared by the aid of photography.

A nephoscope registering by photography, commonly consisting of a pair of cameras used simultaneously.

phy by means of light, as by the heliograph or the photophone. Also, less properly, telephotography. -- Pho`to*tel"e*graph (#), n. --Pho`to*tel`e*graph"ic (#), a.

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

pon 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.

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

r 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.