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The process of giving a dull or ground surface to glass by acid or by mechanical means. Knight.

A glass vessel or bottle with a large body and small neck, inclosed in wickerwork.

A short glass jar fitted with an air-tight cover, and containing some desiccating agent, as sulphuric acid or calcium chloride, above which is suspended the material to be dried, or preserved from moisture.

Potent enemies tempt and deter us from our duty. Tillotson. My own face deters me from my glass. Prior.

used to explode gun cotton in blasting operations. -- Detonating tube, a strong tube of glass, usually graduated, closed at one end, and furnished with two wires passing through its sides at opposite points, and nearly meeting, for the purpose of exploding gaseous mixtures by an electric spark, as in gas analysis, et…

f devitrifying, or the state of being devitrified. Specifically, the conversion of molten glassy matter into a stony mass by slow cooling, the result being the formation of crystallites, microbites, etc., in the glassy base, which are then called devitrification products.

To deprive of glasslike character; to take away vitreous luster and transparency from.

A double-walled glass vessel for holding liquid air, etc., having the space between the walls exhausted so as to prevent conduction of heat, and sometimes having the glass silvered to prevent absorption of radiant heat; -- called also, according to the particular shape, Dewar bulb, Dewar tube, etc.

matic telescope in which the colored dispersion produced by a single object lens of crown glass is corrected by a smaller concave lens, or combination of lenses, of high dispersive power, placed at a distance in the narrower part of the converging cone of rays, usually near the middle of the tube.

Any substance, as bismuth, glass, phosphorous, etc., which in a field of magnetic force is differently affected from the ordinary magnetic bodies, as iron; that is, which tends to take a position at right angles to the lines of magnetic force, and is repelled by either pole of the magnet.

A unit employed by oculists in numbering glasses according to the metric system; a refractive power equal to that of a glass whose principal focal distance is one meter.

Of or pertaining to the dioptre, or to the metric system of numbering glasses. -- n.

sion by means of the refraction of light; refractive; as, the dioptric system; a dioptric glass or telescope. "Dioptrical principles." Nichol. Dioptric curve (Geom.), a Cartesian oval. See under Cartesian.

in passing from one medium into another, or through different mediums, as air, water, or glass, and esp. through different lenses; -- distinguished from catoptrics, which refers to reflected light.

trument for determining the time of apparent noon. It consists of two mirrors and a plane glass disposed in the form of a prism, so that, by the reflections of the sun's rays from their surfaces, two images are presented to the eye, moving in opposite directions, and coinciding at the instant the sun's center is on the…

rt. -- Discharging rod (Elec.), a bent wire, with knobs at both ends, and insulated by a glass handle. It is employed for discharging a Leyden jar or an electrical battery. See Discharger.

scontinuance. Upon any discontinuation of parts, made either by bubbles or by shaking the glass, the whole mercury falls. Sir I. Newton.

hem, and thus giving the appearance of a naturally colored gem. Also, a piece of paste or glass covered by a veneer of real stone.

One who sells distilled liquors by the dram or glass.

es, 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.