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The art or process of producing phototypes.

Of certain achromatic lenses, having the same focus for the actinic and for the brightest of the visual rays.

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

A print made by photozincography. -- Pho`to*zin`co*graph"ic, a.

A process, analogous to photolithography, for reproducing photographed impressions transferred to zinc plate.

The application of photography to the delineation of the sun, moon, and stars.

A photometer for measuring the brightness of stars.

The determination of the brightness of stars, and also of the sun, moon, and planets. --As`tro*pho`to*met"ric*al (#), a.

An instrument combining a cinematograph and a phonograph so that the moving figures on the screen are accompanied by the appropriate sounds.

A picture made by any of the processes for reproducing photographs in colors. --Chro`mo*pho`to*graph"ic (#), a.

The art of producing photographs in colors.

A photolithograph printed in colors.

One of a set of photographs of a moving object, taken for the purpose of recording and exhibiting successive phases of the motion. --Chron`o*pho*tog"ra*phy, n.

Same as Photolithography.

A microscopically small photograph of a picture, writing, printed page, etc.

The art of making microphotographs.

Capable of living without light; as, nonphotobiotic plant cells, or cells which habitually live in darkness.

Excision of the nymphæ.

An instrument for measuring or comparing the intensites of the colors of the spectrum.

The art of comparing, photometrically, the brightness of two spectra, wave length by wave length; the use of the spectrophotometer. --Spec`tro*pho`to*met"ric (#), a.