reverberatory furnace: a furnace in which the material that is being treated is heated indirectly by flames that are directed at the roof and walls of the furnace
furnace: an enclosed chamber in which heat is produced to heat buildings, destroy refuse, smelt or refine ores, etc.
topology: the branch of pure mathematics that deals only with the properties of a figure X that hold for every figure into which X can be transformed with a one-to-one correspondence that is continuous in both directions