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The proportion of ore and flux to fuel, in the charge of a blast furnace. Raymond.

an intense heat by converging the sun's rays to a focus. -- Burning house (Metal.), the furnace in which tin ores are calcined, to sublime the sulphur and arsenic from the pyrites. Weale. -- Burning mirror, a concave mirror, or a combination of plane mirrors, used for the same purpose as a burning glass.…

An oxide of zinc which collects on the sides of furnaces where zinc is sublimed. Formerly applied to the mineral calamine.

A kind of oven, or reverberatory furnace, used for the calcination of sand and potash, and converting them into frit. Ure.

The period during which a blast furnace is continuously in operation.

mbination; carbon silicide. It is made by heating carbon and sand together in an electric furnace. The commercial article is dark-colored and iridescent. It is harder than emery, and is used as an abrasive.

Highly carbonized iron, the direct product of the blast furnace; -- used for making castings, and for conversion into wrought iron and steel. It can not be welded or forged, is brittle, and sometimes very hard. Besides carbon, it contains sulphur, phosphorus, silica, etc.

A native or inbabitant of Catalonia; also, the language of Catalonia. Catalan furnace, Catalan forge (Metal.), a kind of furnace for producing wrought iron directly from the ore. It was formerly much used, esp. in Catalonia, and is still used in some parts of the United States and elsewhere.

An open furnace or forge, in which blooms are heated before being wrought into bars.

t or cell; an inclosed space or cavity; as, the chamber of a canal lock; the chamber of a furnace; the chamber of the eye.

, as of ammunition, electricity, ore, fuel, etc., which any apparatus, as a gun, battery, furnace, machine, etc., is intended to receive and fitted to hold, or which is actually in it at one time

A table stove or small furnace, usually a cylindrical box of sheet iron, with a grate at the bottem, and an open top.

The slag of a furnace, or scoriaceous lava from a volcano. Cinder frame, a framework of wire in front of the tubes of a locomotive, to arrest the escape of cinders. -- Cinder notch (Metal.), the opening in a blast furnace, through which melted cinder flows out.

Scoria or vitrified incombustible matter, formed in a grate or furnace where anthracite coal in used; vitrified or burnt matter ejected from a volcano; slag.

The fire chamber of a furnace. [Eng.] Knight.

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.

erted guns, cast-iron guns lined with wrought-iron or steel tubes. Farrow. -- Converting furnace (Steel Manuf.), a furnace in which wrought iron is converted into steel by cementation.

A furnace for cremating corpses; a building containing such a furnace.

A small furnace or iron cage to hold fire for charring the inside of a cask, and making the staves flexible. Knight.

The dome of a furnace.