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A highly exhausted glass tube with metallic electrodes nearly in contact so as to exhibit the insulating effects of a vacuum. It was used by the German physicist W. Hittorf (b. 1824).

or coarse features; uncomely; -- contrary to handsome. None so homely but loves a looking-glass. South.

A bed of earth heated by fermenting manure or other substances, and covered with glass, intended for raising early plants, or for nourishing exotics.

The process of becoming, or the state of being, transparent like glass.

Glassy; resembling glass; consisting of glass; transparent, like crystal. "Hyaline spaces." Carpenter.

variety of opal in globules looking like colorless gum or resin; -- called also Müller's glass.

An instrument for tracing designs on glass.

Art of writing or engraving on glass.

Resembling glass; vitriform; transparent; hyaline; as, the hyaloid membrane, a very delicate membrane inclosing the vitreous humor of the eye.

ther 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.

An order of vitreous sponges, having glassy six-rayed, siliceous spicules; -- called also Hexactinellinæ.

A photographic picture copied from the negative on glass; a photographic transparency. R. Hunt.

n fluorite, and is usually collected as a solution in water. It attacks all silicates, as glass or porcelain, is the agent employed in etching glass, and is preserved only in vessels of platinum, lead, caoutchouc, or gutta-percha.

isture of the atmosphere. Daniell's hygrometer, a form of hygrometer consisting of a bent glass tube terminating in two bulbs, the one covered with muslin, the other of black glass, and containing ether and a thermometer. Ether being poured on the muslin, the black ball, cooled by the evaporation of the ether within, i…

cope; not readily manifest to the senses, but capable of detection by the hygroscope; as, glass is often covered with a film of hygroscopic moisture.

Partly crystalline; -- said of rock which consists of crystals imbedded in a glassy ground mass.

ca. Its juice is said to be demulcent and diuretic; its ashes are used in Spain in making glass. Ice-skater = one who skates on ice wearing an ice skate; esp. an athlete who performs athletic or artistic movements on a sheet of ice, wearing ice skates; including speed skater and figure skater

Fish glue; isinglass; a glue prepared from the sounds of certain fishes.

otographic plate, or the retina of the eye, and viewed directly by the eye, or with an eyeglass, as in the telescope and microscope; the likeness of an object formed by reflection; as, to see one's image in a mirror. Electrical image. See under Electrical. -- Image breaker, one who destroys images; an iconoclast. --…

us. Etym: [L.] See Index prohibitorius (below). -- Index finger. See Index, 5. -- Index glass, the mirror on the index of a quadrant, sextant, etc. -- Index hand, the pointer or hand of a clock, watch, or other registering machine; a hand that points to something. -- Index of a logarithm (Math.), the integral part…