Assertion: muffle furnace | /r/CapableOf | retort furnace
Facets:
value: sometimes
type: TEMPORAL
value: in historical usage
type: TEMPORAL
Source sentences:
text: A muffle furnace or muffle oven (sometimes retort furnace in historical usage) is a furnace in which the subject material is isolated from the fuel and all of the products of combustion, including gases and flying ash.