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One who or that which intensifies or strengthens; in photography, an agent used to intensify the lights or shadows of a picture.

o render more intense; as, to intensify heat or cold; to intensify colors; to intensify a photographic negative; to intensify animosity. Bacon. How piercing is the sting of pride By want embittered and intensified. Longfellow.

To treat or impregnate with iodine or its compounds; as, to iodize a plate for photography. R. Hunt.

y varnish, and tinted upon the back, upon a stronger print, so as to give the effect of a photograph in natural colors; -- called also hellenotype. Knight.

A camera for making chronophotographs.

an instrument for measuring the intensity of light; a photometer.

ng light (the so-called magnesium light) which is used in signaling, in pyrotechny, or in photography where a strong actinic illuminant is required. Its compounds occur abundantly, as in dolomite, talc, meerschaum, etc. Symbol Mg. Atomic weight, 24.4. Specific gravity, 1.75. Magnesium sulphate. (Chem.) Same as Epsom sa…

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

elfth magnitude or lower. The scale of the magnitudes is quite arbitrary, but by means of photometers, the classification has been made to tenths of a magnitude.

at one end a small convex mirror which reflects a beam of light on to the ground glass or photographic plate at the other end. The mirror is pivoted so that it can be moved in one direction by a small plunger operated by an elastic metal diaphragm which closes a tube connected with the engine cylinder. It is also moved…

Enlarged or magnified; -- said of images or of photographic pictures, etc.

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

Analysis of the structure of materials from careful observation of photomicrographs.

The smallest of regular sizes of portrait photographs.

The cardboard or cloth on which a drawing, photograph, or the like is mounted; a mounting.

A series of pictures, usually photographs taken with a special machine, presented to the eye in very rapid succession, with some or all of the objects in the picture represented in slightly changed positions, producing, by persistence of vision, the optical effect of a continuous picture in which the objects move in so…

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.

An image of external objects fixed on the retina by the photochemical action of light on the visual purple. See Optography.

The production of an optogram on the retina by the photochemical action of light on the visual purple; the fixation of an image in the eye. The object so photographed shows white on a purple or red background. See Visual purple, under Visual.

A camera for obtaining a circular panoramic view of the horizon. The photographic plate is placed horizontally with a vertical lens above. A mirror of peculiar shape reflects light from the entire horizon to the lens, by means of which it is focused upon the plate.