Phosphorus.

A variety of bronze possessing great hardness, elasticity, and toughness, obtained by melting copper with tin phosphide. It contains one or two per cent of phosphorus and from five to fifteen per cent of tin.

To impregnate, or combine, with phosphorus or its compounds; as, phosphorated oil.

Phosphorescent.

To shine as phosphorus; to be phosphorescent; to emit a phosphoric light. Generally, to emit light at temperatures too low to excite incandescent radiation.

The quality or state of being phosphorescent.

Shining with a phosphoric light; emitting phosphorescence; luminous without sensible heat. A phosphorescent substance.

Of or pertaining to phosphorus; resembling, or containing, phosporus; specifically, designating those compounds in which phosphorus has a higher valence as contrasted with the phosphorous compounds.

Phosphoric.

A massive variety of apatite.

Pertaining to phosphorite; resembling, or of the nature of, phosphorite.

To phosphorate.

Containing, or impregnated with, phosphorus.

Generating phosphorescence; as, phosphorogenic rays.

An apparatus for observing the phosphorescence produced in different bodies by the action of light, and for measuring its duration.

Of or pertaining to phosphorus; resembling or containing phosphorus; specifically, designating those compounds in which phosphorus has a lower valence as contrasted with phosphoric compounds; as, phosphorous acid, H3PO3.

The morning star; Phosphor.

The radical PO, regarded as the typical nucleus of certain compounds.

A phosphide.

Impregnated, or combined, with phosphorus.

Of or pertaining to light; specifically, relating to the production of light by the lower animals.

The science of light; -- a general term sometimes employed when optics is restricted to light as a producing vision.

A luminous image or appearance of a hallucinatory character.

A contraction of Photograph.

Acting by the operation of both light and electricity; -- said of apparatus for producing pictures by electric light.

Pertaining to, or capable of developing, photo-electricity.

Electricity produced by light.

An electrometer registering by photography.

An electrotype plate formed in a mold made by photographing on prepared gelatine, etc.

To engrave by a photomechanical process; to make a photo-engraving of.

The process of obtaining an etched or engraved plate from the photographic image, to be used in printing; also, a picture produced by such a process.

A disproportionately rapid growth of the upper surface of dorsiventral organs, such as leaves, through the stimulus of exposure to light.

To engrave, or make an engraving of, by any photomechanical process involving etching of the plate.

A photo-engraving produced by any process involving the etching of the plate.

A genus including certain comma-shaped marine bacteria which emit bluish or greenish phosphorescence. Also, any microorganism of this group.

Requiring light to live; incapable of living without light; as, photobiotic plant cells.

A cathode that emits electrons when illuminated.

An electrical device which changes voltage or resistance upon exposure to light, used to detect and measure light and other radiations.

Art or process of decorating pottery with photographically prepared designs.

Of or pertaining to chemical changes produced by light; as, the photochemical changes of the visual purple of the retina.

The branch 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.

To represent by a colored print made by any photomechanical process.

The art of making photochromotypes.

The art or process of reproducing colors by photography.

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.

Art of recording or measuring intervals of time by the photochronograph.

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.

The art or process of making photo-electrotypes.

A light hydrocarbon oil resembling kerosene. It is obtained by distilling coal, paraffin, etc., and is used as a lubricant, illuminant, etc.

A photograph.

Of or pertaining to photogeny; producing or generating light.

See Photography.

Pertaining to the art of engraving by the action of light.

Photoglyphic engraving. See under Photoglyphic.

Same as Photoglyphic.

A photograph.

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

To practice photography; to take photographs.

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.

A photographer.

An instrument for determining the sensibility of the plates employed in photographic processes to luminous rays.

A device, consisting essentially of an electric arc and a camera, by which a series of photographs of the variations of the arc due to sound waves are obtained for reproduction by means of a selenium cell and a telephone.

The science which relates to the action of light on sensitive bodies in the production of pictures, the fixation of images, and the like. The production of pictures by the photochemical action of light on films of chemicals sensitive to light, and also the production of electronic images in electronic cameras, are both considered types of photography.

A photoengraving; also, the process by which such a picture is produced.

A modified kind of telescope adapted to taking photographs of the sun.

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

To produce (a picture, a copy) by the process of photolithography.

One who practices, or one who employs, photolithography.

Of or pertaining to photolithography; produced by photolithography.

The art or process of producing photolithographs.

Pertaining to photology, or the doctrine of light.

One who studies or expounds the laws of light.

The doctrine or science of light, explaining its nature and phenomena; optics.

Luminescence induced by exposure to light waves in the infrared to ultraviolet range.

Luminescent due to exposure to light waves.

Of or pertaining to photomagnetism.

The branch of science which treats of the relation of magnetism to light.

Pertaining to, or designating, any photographic process in which a printing surface is obtained without the intervention of hand engraving.

An instrument for measuring the intensity of light, or, more especially, for comparing the relative intensities of different lights, or their relative illuminating power.

Of or pertaining to photometry, or to a photometer.

One engaged in the scientific measurement of light; a specialist in photometry.

That branch of science which treats of the measurement of the intensity of light.

A photomechanical process similar to collotype.

An enlarged or macroscopic photograph of a microscopic object. See Microphotograph.

The art of producing photomicrographs.

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

Light-loving; growing in strong light, as many plants.

A dread or intolerance of light.

An apparatus for the production of sound by the action of rays of light.

Of or pertaining to photophone.

The art or practice of using the photophone.

A form of endoscope using an electric light.

A play for representation or exhibition by moving pictures; also, the moving-picture representation of a play.

Any print made by a photomechanical process.

An affection of the eye, in which the patient perceives luminous rays, flashes, coruscations, etc. See phosphene.

Same as Photopsia.

A printing surface in relief, obtained by photographic means and subsequent manipulations.

Anything employed for the observation of light or luminous effects.

Of or pertaining to the photoscope or its uses.

A process in which, by means of a number of photographs simultaneously taken from different points of view on the same level, rough models of the figure or bust of a person or animal may be made with great expedition.

A sphere of light; esp., the luminous envelope of the sun.

Of or pertaining to the photosphere.

The process of constructive metabolism in which green plants utilize the energy of sunlight to manufacture carbohydrates from carbon dioxide and water in the presence of chlorophyll. It was formerly called assimilation, but this is now commonly used as in animal physiology.

The influence of light on the movements of low organisms, as various infusorians, the zoospores of certain alg/, etc.; also, the tendency to follow definite directions of motion or assume definite positions under such influence. If the migration is toward the source of light, it is termed positive phototaxis; if away from the light, negative phototaxis.

Telegraphy by means of light, as by the heliograph or the photophone. Also, less properly, telephotography.

A telescope adapted for taking photographs of the heavenly bodies.

An arrangement of two photographic cameras, the plates of which may be brought into exactly the same plane, used in surveying and map making. From the differences between two pictures taken at the same moment, measurements in all dimensions of the region may be obtained.

The application of light for therapeutic purposes, esp. for treating diseases of the skin.

Of or pertaining to both light and heat.

A motile condition in plants resulting from exposure to light.

Photogrammetry.

Designating a photomechanical process for making reproductions in natural colors by three printings.

of or pertaining to phototropism; exhibiting phototropism; same as Heliotropic.

The tendency of growing plant organs to move or curve under the influence of light. In ordinary use the term is practically synonymous with heliotropism.

A plate or block with a printing surface (usually in relief) obtained from a photograph; also, any one of the many methods of processes by which such a printing surface is obtained.