Furnace

“The more modern furnaces are constructed like this, but the masonry at the base is still less massive, so that, instead of there being four distinct tuyere houses, the separating walls of the houses are wholly cut away and replaced by a number of stout iron pillars on which rests the greater portion of the weight of the superstructure; through the walls of the hearth are pierced conical arched openings for the tuyeres; the throat is fitted with a valve for introducing materials from time to time, such as the cup and cone arrangement.” — The Encyclopedia Britannica, 1893

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