EARTH COLOURS i66 The best calcining furnace is of the type used for colcothar; but the pipes must be connected to an exhaust pipe for carrying off the vapours disengaged during calcination. However, since alum manufacturers do not usually go in for making the highest-grade pigments, simpler… … FIG. 31. elevation and section of such a furnace are shown in Figs. 30 and 31. The furnace is constructed with several arches, one above another, marked c, k, d. The charge is introduced through the openings b and b'. The furnace chamber is at a, and the ashpit at g. The gases of combustion flow…
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Internet Archive · Gerstein - University of Toronto · Public domain (published before 1931). Free to use for anything.
