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This may be effected in crucibles, or, still better, in reverberatory furnaces, where a large quantity may be melted more conveniently.

The red hot stones in Gaul were probably as much figments of imagination as was the assumption of one commentator that they were a reverberatory furnace.

The calcination, or roasting, is conducted at a low temperature in some form of reverberatory furnace.

By the continued oxidation of litharge in reverberatory furnaces, red lead is produced as a brilliant red pigment with a specific gravity of 8.7.

This is especially necessary in the case of reverberatory furnaces, which are essentially weak structures, and therefore require to be bound together by complicated systems of tie rods and uprights or buck staves.