The charcoal is preserved from rain under a shed, l.
The ore, which is brought in as needed, is dumped in a pile at M, in
the vicinity of the crucibles. The buildings are set back against the
mountain, and the water is led in by a double flume, L and N, made of
planks, and empties on one side into the wheel and into the tromp, F,
and on the other into the tromp, E, and then runs into a double waste
channel, P and Q, which carries it to the stream.
[Illustration: FIG 2.--FOUR-CRUCIBLE FURNACE; (PLAN).]
_Four Crucible Furnace_ (Fig. 2).--The arrangement of a furnace is very
simple. It consists of a cube of masonry containing several cylindrical
apertures with elliptic bases, whose large axis is paralleled with the
smaller side of the masonry. This form recalls that of a crucible;
and these cavities are, moreover, so named. In the front part of each
cadinhe there is a rectangular aperture that gives access to the bottom
of the crucible and facilitates the removal of the bloom therefrom.
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