Following these steps, the bomb was capped with refractory, sealed, and placed in one of 49 electric muffle furnaces.

External heating has to be applied, the blende being raked in a series of muffle furnaces through which air circulates.

The carbonaceous residue is reduced to ash by heating in a Muffle furnace at about 775C, cooled and weighed.

After the development of high-temperature electric heating elements and widespread electrification in developed countries, new muffle furnaces quickly moved to electric designs.

This method (so-called "Silesian method"), used horizontal muffle furnaces which permitted for continuous operation, i.e., loading the input and unloading the product without cooling.

Today, a muffle furnace is (usually) a front-loading box-type oven or kiln for high-temperature applications such as fusing glass, creating enamel coatings, ceramics and soldering and brazing articles.

The muffle furnace was in a corner and looked rather much like a small beige ceramic crematorium, the size of a hotel mini-bar, to be exact, that could heat up to as much as twenty-five-hundred degrees Fahrenheit.

A muffle furnace (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.

The term muffle furnace may also be used to describe another oven constructed on many of the same principles as the box type kiln mentioned above, but takes the form of a long, wide, and thin hollow tube used in roll to roll manufacturing processes.

Bismuth Telluride is prepared by sealing a sample of bismuth and tellurium metal in a quartz tube under vacuum (critical, as an unsealed or leaking sample may explode in a furnace) and heating it to 800 C in a muffle furnace.