If hot air is introduced into the kiln, the additional heat developed by the oxidation of the zinc and the sulphur is sufficient to keep up a part of the reaction; but for the complete expulsion of the sulphur an externally-fired muffle through which the ore is passed is found to be essential.
muffle הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד