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Saltwort :: Saltwort (n.) A name given to several plants which grow on the seashore, as the Batis maritima, and the glasswort. See Glasswort..

Muff :: Muff (n.) A blown cylinder of glass which is afterward flattened out to make a sheet.

Binocle :: Binocle (n.) A dioptric telescope, fitted with two tubes joining, so as to enable a person to view an object with both eyes at once; a double-barreled field glass or an opera glass..

Negative :: Negative (n.) A picture upon glass or other material, in which the light portions of the original are represented in some opaque material (usually reduced silver), and the dark portions by the uncovered and transparent or semitransparent ground of the picture..

Drop :: Drop (n.) That which resembles, or that which hangs like, a liquid drop; as a hanging diamond ornament, an earring, a glass pendant on a chandelier, a sugarplum (sometimes medicated), or a kind of shot or slug..

Foliation :: Foliation (n.) The act of coating with an amalgam of tin foil and quicksilver, as in making looking-glasses..

Dynactinometer :: Dynactinometer (n.) An instrument for measuring the intensity of the photogenic (light-producing) rays, and computing the power of object glasses..

Arsenious :: Arsenious (a.) Pertaining to, consisting of, or containing, arsenic; as, arsenious powder or glass..

Etching :: Etching (n.) The act, art, or practice of engraving by means of acid which eats away lines or surfaces left unprotected in metal, glass, or the like. See Etch, v. t..

Phantasmagoria :: Phantasmagoria (n.) An optical effect produced by a magic lantern. The figures are painted in transparent colors, and all the rest of the glass is opaque black. The screen is between the spectators and the instrument, and the figures are often made to appear as in motion, or to merge into one another..

Optometer :: Optometer (n.) An instrument for measuring the distance of distinct vision, mainly for the selection of eveglasses..

Blow :: Blow (v. t.) To form by inflation; to swell by injecting air; as, to blow bubbles; to blow glass..

Connector :: Connector (n.) A flexible tube for connecting the ends of glass tubes in pneumatic experiments.

Bull''s-eye :: Bull's-eye (n.) A lantern, with a thick glass lens on one side for concentrating the light on any object; also, the lens itself..

Bocal :: Bocal (n.) A cylindrical glass vessel, with a large and short neck..

Dynameter :: Dynameter (n.) An instrument for determining the magnifying power of telescopes, consisting usually of a doubleimage micrometer applied to the eye end of a telescope for measuring accurately the diameter of the image of the object glass there formed; which measurement, compared with the actual diameter of the glass, gives the magnifying power..

Isinglass :: Isinglass (n.) A semitransparent, whitish, and very pure from of gelatin, chiefly prepared from the sounds or air bladders of various species of sturgeons (as the Acipenser huso) found in the of Western Russia. It used for making jellies, as a clarifier, etc. Cheaper forms of gelatin are not unfrequently so called. Called also fish glue..

Aventurine :: Aventurine (n.) A kind of glass, containing gold-colored spangles. It was produced in the first place by the accidental (par aventure) dropping of some brass filings into a pot of melted glass..

Rupert''s Drop :: Rupert's drop () A kind of glass drop with a long tail, made by dropping melted glass into water. It is remarkable for bursting into fragments when the surface is scratched or the tail broken; -- so called from Prince Rupert, nephew of Charles I., by whom they were first brought to England. Called also Rupert's ball, and glass tear..

Dioptrical :: Dioptrical (a.) Of or pertaining to dioptrics; assisting vision by means of the refraction of light; refractive; as, the dioptric system; a dioptric glass or telescope..

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