The generating chamber is horizontal
and is fixed in the base of the tank, so that its outer case is
surrounded by the water in the tank, with the object of keeping it cool.
The charge of carbide is placed in a partitioned container, and is
gradually attacked on the flooding principle by the water which enters
from the gasholder tank when the ball valve is depressed. The gas evolved
passes from the generating chamber by a pipe which extends above the
level of the water in the tank, and is then bent down so that its end
dips several inches below the level of the water. The gas issuing from
the end of the pipe is thus washed by the water in the gasholder tank.
From the gasholder the gas is taken off as required for use by a pipe,
the mouth of which is just below the crown of the holder. There is a lip
in the upper edge of the gasholder tank into which water is poured from
time to time to replace that consumed in the generation of the gas. There
are from one to three generating chambers in each apparatus according to
its size. The purifier is independent, and a purifying mixture under the
proprietary name of "Curazo" is supplied for use in it.
[Illustration: FIG.
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