To decrease or dull the sound of
To hold (something requiring an outlet) in check
Muffle furnaces are suitable for fine ores which are liable to decrepitate or sinter.
(a) Heating chamber fixed and forming part of furnace= muffle furnaces.
The " muffle," a graphite cylinder 6 in.
The precipitate is collected in a filter-press, and then roasted in muffle furnaces with nitre, borax and sodium carbonate.
high, and heated either in a muffle or in a crucible furnace at a gradually increasing heat for forty or fifty minutes.