Part 192

||Phleg"e*thon (?), n. [L., fr. Gr. &?;, prop. p.pr. of &?; to blaze.] (Class Myth.) One of the principal rivers of Hades, in the channel of which fire flowed instead of water.

Fierce Phlegethon, Whose waves of torrent fire inflame with rage.

Milton.

Phone, n. & v. t. Colloq. for Telephone.

Phos"phine (?), n. (Dyeing) Chrysaniline, often in the form of a salt.

Phosphorus steel. A steel in which the amount of phosphorus exceeds that of carbon.

Pho"tic (?), a. [Gr. &?;, &?;, light.] Of or pert. to light; specif., relating to the production of light by the lower animals.

Photic region. (Phytogeography) The uppermost zone of the sea, which receives the most light.

Pho"tism (?), n. [Gr. &?; illumination.] (Psycol.) A luminous image or appearance of a hallucinatory character.

||Pho`to*bac*te"ri*um (?), n. [NL. See Photo-, and Bacterium.] (Bacteriol.) A genus including certain comma-shaped marine bacteria which emit bluish or greenish phosphorescence. Also, any microörganism of this group.

Pho`to*ce*ram"ics (?), n. Art or process of decorating pottery with photographically prepared designs. -- Pho`to*ce*ram"ic (#), a.

Pho`to*chro*mog"ra*phy (?), n. [Photo- + Gr. &?; color + -graphy.] Art or process of printing colored photographs.

Pho`to*chro"mo*scope (?), n. [Photo- + Gr. &?; color + -scope.] 1. A device for giving shifting effects of color to a photograph. The unmounted print, made translucent, is illuminated from behind with colored light.

2. A combination of three optical lanterns for projecting objects on a screen in the colors of nature. The images of three partial photographs taken through color screens (red, green, and blue, respectively) are superimposed. Each image is given its own primary color, and these colors blend and reproduce the colors of the object.

Pho`to*chro"mo*type (?), n. [Photo- + Gr. &?; color + -type.] A colored print made photomechanically.

Pho`to*chro"mo*type, v. t. To represent by a colored print made by any photomechanical process.

Pho`to*chro"mo*typ`y (?), n. The art of making photochromotypes.

Pho`to*chron"o*graph (?), n. [Photo- + chronograph.] 1. (Physics) An instrument for recording minute intervals of time. The record is made by the power of a magnetic field, due to an electric signaling current, to turn the plane of polarization of light. A flash, coinciding in time and duration with the signal, is thus produced and is photographed on a moving plate.

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

Pho`to*chro*nog"ra*phy (?), n. 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.

Pho`to*dy*nam"ics (?), n. [Photo- + dynamics.] (Plant Physiol.) 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.

{ Pho`to-e*lec"tric, Pho`to-e*lec"tric*al }, a. Pert. to, or capable of developing, photo- electricity.

Photo-electric cell. A cell (as one of two electrodes embedded in selenium) which by exposure to light generates an electric current.

Pho`to-e*lec*tric"i*ty, n. [Photo- + electricity.] Electricity produced by light.

Pho`to-e*lec"tro*graph, n. [See Photo-; Electrograph.] (Meteor.) An electrometer registering by photography.

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Pho`to-en*grave" (?), v. t. [imp. & p. p. Photo-engraved (?); p. pr. & vb. n. Photo-engraving.] [Photo- + engrave.] To engrave by a photomechanical process; to make a photo-engraving of. -- Pho`to-en*grav"er (#), n.

Pho`to-etch" (?), v. t. [imp. & p. p. Photo-etched (?); p. pr. & vb. n. Photo-etching.] [Photo- + etch.] To engrave, or make an engraving of, by any photomechanical process involving etching of the plate.