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f sporangia, in certain ferns, as in the common brake, or the cup-shaped processes of the filmy ferns.

A philosophical toy for exhibiting the prismatic tints by means of thin films.

The caul; that which covers or envelops as a caul; a net; a fold; a film. [Obs.] I'll have him cut to the kell. Beau. & Fl.

A machine, for the production of animated pictures, in which a film carrying successive instantaneous views of a moving scene travels uniformly through the field of a magnifying glass. The observer sees each picture, momentarily, through a slit in a revolving disk, and these glimpses, blended by persistence of vision,…

Damaged by accidental exposure to light; light-fogged; -- said of plates or films.

ion of some metallic compound; specifically, the prismatic tints produced by depositing a film of peroxide of lead on polished steel by electricity.

A film or membrane which is developed on the surface of fermented alcoholic liquids, such as vinegar, wine, etc., and acts as a means of conveying the oxygen of the air to the alcohol and other combustible principles of the liquid, thus leading to their oxidation.

to subject (a plate or film) too long to the developing process.

to subject (a plate or film) too long to the actinic action of the light used in producing a picture. -- O`ver*ex*po"sure (#), n.

A whitish speck or film on the eye. [Obs.] Milton.

A thin skin or film.

ing bodies by optical means. It consists of a tube across the end of which is stretched a film of soap solution thin enough to give colored bands, the form and position of which are affected by sonorous vibrations.

ure, on the same plate with star images to facilitate measurements, detect changes of the film, etc.

to moist air, consisting of ferric oxide or hydroxide; hence, by extension, any metallic film of corrosion.

An instrument or apparatus for comparing and grading the sensitiveness of plates, films, etc., as a screen divided into squares of different shades or colors, from which a picture is made on the plate to be tested.

The art or process of covering metals, wood, paper, glass, etc., with a thin film of metallic silver, or a substance resembling silver; also, the firm do laid on; as, the silvering of a glass speculum.

To cover with skin, or as with skin; hence, to cover superficially. It will but skin and film the ulcerous place. Shak.

A flake, or small filmy mass, of snow.

That property, due to molecular forces, which exists in the surface film of all liquids and tends to bring the contained volume into a form having the least superficial area. The thickness of this film, amounting to less than a thousandth of a millimeter, is considered to equal the radius of the sphere of molecular act…

A thin film on the surface of a metal, usually due to a slight alteration of the original color; as, the steel tarnish in columbite.