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To make an indentation in the edge of a metal plate, as along a seam in a steam boiler or an iron ship, to force the edge of the upper plate hard against the lower and so fill the crevice.

and played by keys arranged like those of an organ. It is sometimes attached to steamboat boilers.

primary nut to secure it. Knight. -- Check valve (Mech.), a valve in the feed pipe of a boiler to prevent the return of the feed water. -- To take check, to take offense. [Obs.] Dryden.

A jacket or outer covering of wood, etc., to prevent radiation of heat, as from the boiler, cylinder. etc., of a steam engine.

A covering of non-conducting material on the outside of a boiler, or steam chamber, to prevent radiation of heat. Knight.

ides or parts of (a thing) fall in together, or be crushed in together; as, a flue in the boiler of a steam engine sometimes collapses. A balloon collapses when the gas escapes from it. Maunder.

A space over, or in front of , a boiler furnace where the gases from the fire become more thoroughly mixed and burnt. (b) The clearance space in the cylinder of an internal combustion engine where the charge is compressed and ignited.

A vessel, especially a large boiler, made of copper.

Having a bottom made of copper, as a tin boiler or other vessel, or sheathed with copper, as a ship.

nging from the rim. -- Crown bar, one of the bars which support the crown sheet of steam-boiler furnace. -- Crown glass. See under Glass. -- Crown imperial. (Bot.) See in the Vocabulary. -- Crown jewels, the jewels appertaining to the sovereign while wearing the crown. [Eng.] "She pawned and set to sale the crown j…

(c) To interrupt; as, to cut off communication; to cut off (the flow of) steam from (the boiler to) a steam engine. (d) To intercept; as,, to cut off an enemy's retreat.

To soften by heat and moisture; to expose to a gentle heat in a boiler or matrass, as a preparation for chemical operations.

receptacle, into a fluid and removing a part; -- often with out; as, to dip water from a boiler; to dip out water.

of a building; as the upper part of a furnace, the vertical steam chamber on the top of a boiler, etc.

engine, a small auxiliary engine not used for propelling, but for pumping water into the boilers, raising heavy weights, and like purposes. -- Donkey pump, a steam pump for feeding boilers, extinguishing fire, etc.; -- usually an auxiliary. -- Donkey's eye (Bot.), the large round seed of the Mucuna pruriens, a tropi…

ing combustible gases downward from the top of the blast furnace to the hot-blast stoves, boilers, etc., where they are burned.

t constructors of it. -- Dry pipe (Steam Engine), a pipe which conducts dry steam from a boiler. -- Dry plate (Photog.), a glass plate having a dry coating sensitive to light, upon which photographic negatives or pictures can be made, without moistening. -- Dry-plate process, the process of photographing with dry pl…

Specifically: (Steam Boilers) An arrangement of pipes for heating feed water by waste heat in the gases passing to the chimney.

of currents from the conducting wires, caused by defective insulation. Escape pipe (Steam Boilers), a pipe for carrying away steam that escapes through a safety valve. -- Escape valve (Steam Engine), a relief valve; a safety valve. See under Relief, and Safety. -- Escape wheel (Horol.), the wheel of an escapement.…

of Essex evaporated his thoughts in a sonnet. Sir. H. Wotton. Evaporating surface (Steam Boilers), that part of the heating surface with which water is in contact.