mcdougall furnace

mcdougall furnace
\\mə̇kˈdügəl-\ noun
Usage: usually capitalized M&D
Etymology: after McDougall, 19th century British engineer
: a roasting furnace consisting of a vertical cylindrical shaft containing several superposed hearths over which ore entering at the top is made to pass consecutively by mechanical rabbles rotating around a central shaft

Useful english dictionary. 2012.

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