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A TREATISE ON
done by pntting the two into a tnb and beating them
up together with a stick. Without this, the water
comes through first, and the highwines afterwards,
which in a short time renders the coal unfit for use,
and requires new coal. From three to four months'
use, is sufficient to spoil any rectifiers in which the
mixing is done. Instead of this, by our method, the
coal may be made to last 12 to 15 months. Another
cause by which the coal may be spoiled is, by the
accumulation of verdigris and :filth on the top of it.
This we must also guard against. Again: the large
amount of liquor, generally at first, on the top of the
coal forces itself through with such rapidity as to
the spoil the coal and receive but little benefit
to itself. To avoid this objection, we run it slowly
from the mixer by means of faucets and pipes, and
keep it running at pleasure. By paying attention to
the rules laid down in this system, the coal in use
may be kept good twelve to eighteen months-which
is a saving of seventy-five per cent. in coal alone.
The Rectifiers andMixers should be made of well
seasoned
WHITE OAK,
of the dimensions, and placed in
the position indicated by the annexed cut. Covers
should be made to fit them closely.
Digitized
by