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Muf′fle—fur′nace.


Metallurgy.) A furnace with a chamber which is surrounded by incandescent fuel, and in which cupellation or fusion of metals is performed; the former especially. (See cupellation.) The holes in the sides of the muffle are important, as through them a draft is established which oxidizes the lead and some other associated metals.

Muffle-furnace.

a, muffle.c, closed muffle.
b, muffle-furnace.d, cupel-mold.

In the process of assaying, the muffle contains the cupel in which the metal is placed.

Arsenic is sublimed from arsenical pyrites in a muffle whose eduction-channel leads to a condensing chamber where the arsenious acid is deposited. See arsenic-furnace; cupellation.

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