WELSBACH a.
ustion of a mixture of air and gas or vapor is employed to heat to incandescence a mantle composed of thoria and ceria. The mantle is made by soaking a "stocking" in a solution of nitrates of thorium and cerium (approx. 99 : 1), drying, and, for use, igniting to burn the thread and convert the nitrates into oxides, whi…
WHEEL n.
A circular frame turning about an axis; a rotating disk, whether solid, or a frame composed of an outer rim, spokes or radii, and a central hub or nave, in which is inserted the axle, -- used for supporting and conveying vehicles, in machinery, and for various purposes; as, the wheel of a wagon, of a locomotive, of a m…
WHITE a.
n the same proportion as in the light coming directly from the sun, without having been decomposed, as by passing through a prism. See the Note under Color, n., 1. (b) A kind of firework which gives a brilliant white illumination for signals, etc. -- White lime, a solution or preparation of lime for whitewashing; whit…
WINE n.
wine by the evaporation of water; also, a stand for wine bottles, containing ice.a drink composed of approximately equal parts of wine and some carbonated beverage (soda). Also called California cooler. -- Wine fly (Zoöl.), small two-winged fly of the genus Piophila, whose larva lives in wine, cider, and other fermen…
YEAST n.
ot.), the vegetable organism, or fungus, of which beer yeast consists. The yeast plant is composed of simple cells, or granules, about one three-thousandth of an inch in diameter, often united into filaments which reproduce by budding, and under certain circumstances by the formation of spores. The name is extended to…
ZINC n.
thyl; -- called also zinc amide. -- Zinc amyle (Chem.), a colorless, transparent liquid, composed of zinc and amyle, which, when exposed to the atmosphere, emits fumes, and absorbs oxygen with rapidity. -- Zinc blende Etym: [cf. G. zinkblende] (Min.), a native zinc sulphide. See Blende, n. (a) -- Zinc bloom Etym: [cf…