C.
or thereabouts in a manner resembling that of the production of water-gas.
The last generator impurity is lime dust, which is calcium oxide or
hydroxide carried forward by the stream of gas in a state of extremely
fine subdivision, and is liable to be produced whenever water acts
rapidly upon an excess of calcium carbide. This lime occasionally appears
in the alternative form of a froth in the pipes leading directly from the
generating chamber; for some types of carbide-to-water apparatus,
decomposing certain kinds of carbide, foam persistently when the liquid
in them becomes saturated with lime, and this foam or froth is remarkably
difficult to break up.
FILTERS.--It has just been stated that the purifying system added to an
acetylene installation should not be called upon to remove these
generator impurities; because their appearance in quantity indicates a
faulty generator, which should be replaced by one of better action. On
the contrary, with the exception of the gases which are permanent at
atmospheric temperature--hydrogen, carbon monoxide, nitrogen, and oxygen--
and which, once produced, must remain in the acetylene (lowering its
illuminating value, but giving no further trouble), extraction of these
generator impurities is quite simple.
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