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The cleaning of the flues of a boiler from scale, etc., by a blast of steam.

before the upper part of a grate or open fire. (b) A machine for producing an artificial blast or current of air by pressure, as for increasing the draft of a furnace, ventilating a building or shaft, cleansing gram, etc.

wrought iron tube, on the end of which the workman gathers a quantity of "metal" (melted glass), and through which he blows to expand or shape it; -- called also blowing tube, and blowpipe.

he seven colors into which the rays of light divide themselves, when refracted through a glass prism; the color of the clear sky, or a color resembling that, whether lighter or darker; a pigment having such color. Sometimes, poetically, the sky.

One of a class of paupers or pensioners, or licensed beggars, in Scotland, to whim annually on the king's birthday were distributed certain alms, including a blue gown; a beadsman.

A red or reddish color; a rosy tint. Light's last blushes tinged the distant hills. Lyttleton. At first blush, or At the first blush, at the first appearance or view. "At the first blush, we thought they had been ships come from France." Hakluyt.

ce; to force by blustering; to bully. He bloweth and blustereth out . . . his abominable blasphemy. Sir T. More. As if therewith he meant to bluster all princes into a perfect obedience to his commands. Fuller.

t, advice boat, etc. The term is sometimes applied to steam vessels, even of the largest class; as, the Cunard boats.

A cylindrical glass vessel, with a large and short neck.

The round hole in the furnace of a glass manufactory through which the fused glass is taken out. Craig.

One who lives in a boggy country; -- applied in derision to the lowest class of Irish. Halliwell.

A liquor made of rum and molasses. [Local, U. S.] Bartlett.

Zoöl.), a small bird of Europe and America (Ampelis garrulus); the waxwing. -- Bohemian glass, a variety of hard glass of fine quality, made in Bohemia. It is of variable composition, containing usually silica, lime, and potash, rarely soda, but no lead. It is often remarkable for beauty of color.

near Bologna. It is phosphorescent when calcined. -- Bologna vial, a vial of unannealed glass which will fly into pieces when its surface is scratched by a hard body, as by dropping into it a fragment of flint; whereas a bullet may be dropped into it without injury.

A long, straightnecked, glass vessel for chemical distillations; -- called also a matrass or receiver.

A thin spheroidal glass retort or flask, used in the sublimation of camphor. [Written also bumbelo, and bumbolo.]

A soft, elastic, very durable cap, made of thick, seamless woolen stuff, and worn by men in Scotland. And pbonnets waving high. Sir W. Scott.

Northern; pertaining to the north, or to the north wind; as, a boreal bird; a boreal blast. So from their own clear north in radiant streams, Bright over Europe bursts the boreal morn. Thomson.

One of the sloping sides of the lower part of a blast furnace; also, one of the hollow iron or brick sides of the bed of a puddling or boiling furnace.

of the structure of plants, the functions of their parts, their places of growth, their classification, and the terms which are employed in their description and denomination. See Plant.