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a. A semi-cylindrical or long, arched oven (usually small and made of
fireclay), heated from outside, in which substances may be exposed at high
temperature to an oxidizing atmospheric current, and kept at the same time
from contact with the gases from the fuel. Cupellation and scorification
assays are performed in muffles; on a larger scale, copper ores were
formerly roasted in muffle furnaces. Fay
b. An enclosure in a furnace to protect the ware from the flame and
products of combustion. ASTM
Source:
Dictionary of Mining, Mineral, and Related Terms
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