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Slide :: Slide (n.) A plate or slip of glass on which is a picture or delineation to be exhibited by means of a magic lantern, stereopticon, or the like; a plate on which is an object to be examined with a microscope..

Hyalonema :: Hyalonema (n.) A genus of hexactinelline sponges, having a long stem composed of very long, slender, transparent, siliceous fibres twisted together like the strands of a color. The stem of the Japanese species (H. Sieboldii), called glass-rope, has long been in use as an ornament. See Glass-rope..

Crystallite :: Crystallite (n.) A minute mineral form like those common in glassy volcanic rocks and some slags, not having a definite crystalline outline and not referable to any mineral species, but marking the first step in the crystallization process. According to their form crystallites are called trichites, belonites, globulites, etc..

Transmit :: Transmit (v. t.) To suffer to pass through; as, glass transmits light; metals transmit, or conduct, electricity..

Pearlash :: Pearlash (n.) A white amorphous or granular substance which consists principally of potassium carbonate, and has a strong alkaline reaction. It is obtained by lixiviating wood ashes, and evaporating the lye, and has been an important source of potassium compounds. It is used in making soap, glass, etc..

Eyeglass :: Eyeglass (n.) A lens of glass to assist the sight. Eyeglasses are used singly or in pairs.

Putty :: Putty (n.) A kind of thick paste or cement compounded of whiting, or soft carbonate of lime, and linseed oil, when applied beaten or kneaded to the consistence of dough, -- used in fastening glass in sashes, stopping crevices, and for similar purposes..

Hyalotype :: Hyalotype (n.) A photographic picture copied from the negative on glass; a photographic transparency.

Sneak-cup :: Sneak-cup (n.) One who sneaks from his cups; one who balks his glass.

Plane-parallel :: Plane-parallel (a.) Having opposite surfaces exactly plane and parallel, as a piece of glass..

Leyden Phial :: Leyden phial () A glass jar or bottle used to accumulate electricity. It is coated with tin foil, within and without, nearly to its top, and is surmounted by a brass knob which communicates with the inner coating, for the purpose of charging it with electricity. It is so named from having been invented in Leyden, Holland..

Frost :: Frost (v. t.) To cover with hoarfrost; to produce a surface resembling frost upon, as upon cake, metals, or glass..

Cassius :: Cassius (n.) A brownish purple pigment, obtained by the action of some compounds of tin upon certain salts of gold. It is used in painting and staining porcelain and glass to give a beautiful purple color. Commonly called Purple of Cassius..

Micrometer :: Micrometer (n.) An instrument, used with a telescope or microscope, for measuring minute distances, or the apparent diameters of objects which subtend minute angles. The measurement given directly is that of the image of the object formed at the focus of the object glass..

Passe Partout :: Passe partout (n.) A light picture frame or mat of cardboard, wood, or the like, usually put between the picture and the glass, and sometimes serving for several pictures..

Fluorine :: Fluorine (n.) A non-metallic, gaseous element, strongly acid or negative, or associated with chlorine, bromine, and iodine, in the halogen group of which it is the first member. It always occurs combined, is very active chemically, and possesses such an avidity for most elements, and silicon especially, that it can neither be prepared nor kept in glass vessels. If set free it immediately attacks the containing material, so that it was not isolated until 1886. It is a pungent, corrosive, colorles

Glasseye :: Glasseye (n.) A species of blindness in horses in which the eye is bright and the pupil dilated; a sort of amaurosis.

Lieberkuhn :: Lieberkuhn (n.) A concave metallic mirror attached to the object-glass end of a microscope, to throw down light on opaque objects; a reflector..

Tumbler :: Tumbler (n.) A drinking glass, without a foot or stem; -- so called because originally it had a pointed or convex base, and could not be set down with any liquor in it, thus compelling the drinker to finish his measure..

Bull''s-eye :: Bull's-eye (n.) A thick knob or protuberance left on glass by the end of the pipe through which it was blown.

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