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glass

glass

A transparent substance composed of silica and oxides of various bases. [A.S. glaes]
cover g. a thin g. disk or plate covering an object examined under the microscope.coverslip;
Crookes' g. a spectacle lens combined with metallic oxides to absorb ultraviolet or infrared rays.
crown g. a compound of lime, potash, alumina, and silica; commonly used in lenses; has a low dispersion (52.2) relative to index of refraction (1.523).
cupping g. a g. vessel, from which the air has been exhausted by heat or a special suction apparatus, formerly applied to the skin in order to draw blood to the surface. See also cupping, cup.cup (2) ;
flint g. g. that contains lead oxide instead of lime to increase index of refraction; used in reading segments of fused bifocal lenses.
object g. objective (1)
quartz g. a transparent, colorless crystal, made by fusing pure quartz sand, which transmits ultraviolet light.
soluble g. a silicate of potassium or sodium, soluble in hot water but solid at ordinary temperatures; used for fixed dressings.water g;
vita g. a specially prepared g. that is transparent to ultraviolet rays of the spectrum.
water g. soluble g
Wood's g. a g. containing nickel oxide, used in Wood's lamp.

 

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