Under these
circumstances manufacturers located in certain districts need give the
matter no further thought, let the coming winter be as severe as it
may.
Some success has been obtained by the use of sulphurous acid in vacuum
pans. Great care is required; the operation cannot be done by an
ordinary workman. It is claimed that graining thereby is more rapid
and better than is now possible. Chemists agree that the operation is
more effectual by bringing sulphurous acid in contact with sirups
rather than juices; it is in the sirups that the coloring pigments are
found. Sulphurous acid is run into the pan until the sirups cover the
second coil. In all cases the work must be done at a low temperature.
Height of juice in carbonatating tanks is only three feet in France,
while in Austria it is frequently twelve feet. The question of a
change in existing methods is being discussed; it necessitates an
increase in the blowing capacity of machine; since carbonic acid gas
has a greater resistance to overcome in Austrian than in French
methods.
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