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

Of or pertaining to photochromy; produced by photochromy.

Art or process of printing colored photographs.

A device for giving shifting effects of color to a photograph. The unmounted print, made translucent, is illuminated from behind with colored light.

A colored print made photomechanically.

The art of making photochromotypes.

The art or process of reproducing colors by photography.

(Astron.) An instrument for the photographic recording of star transits.

Art of recording or measuring intervals of time by the photochronograph. -- Pho`to*chron`o*graph"ic (#), -graph"ic*al (#), a. -- -graph"ic*al*ly, adv.

An apparatus consisting of a large wheel with spokes, which when turning very rapidly is illuminated by momentary flashes of light passing through slits in a rotating disk. By properly timing the succession of flashes the wheel is made to appear to be motionless, or to rotate more or less slowly in either direction.…

The relation of light to the movements of plants and their organs; the study of the phenomena of curvatures induced by the stimulus of light. --Pho`to*dy*nam"ic (#), Pho`to*dy*nam"ic*al (#), a.

The art or process of making photo-electrotypes. Sir D. Brewster.

tilling coal, paraffin, etc., and is used as a lubricant, illuminant, etc. [Written also photogene.]

A photograph. [Obsoles.]

Of or pertaining to photogeny; producing or generating light.

See Photography. [Obsoles.]

Pertaining to the art of engraving by the action of light. [Written also photoglyptic.] Photoglyphic engraving, a process of etching on copper, steel, or zinc, by means of the action of light and certain chemicals, so that from the plate impressions may be taken. Sir D. Brewster.

Photoglyphic engraving. See under Photoglyphic.

Same as Photoglyphic.

A photograph. [R.]