Thus the impurities acquired by the water
from the washing of the gas do not accumulate in it to such an extent as
to render it necessary to run off the whole of the water and refill,
except at long intervals. A purifier, ordinarily charged with puratylene,
is inserted in many cases after the main cock _R_. The same firm
makes an automatic generator on somewhat similar lines, specially
designed for use in autogenous welding, the smaller sizes of which are
readily portable.
[Illustration: FIG. 47.--"DARGUE" GENERATOR.]
_Maker_: J. AND J. DRUMMOND, 162 MARKET STREET, ABERDEEN.
_Type_: Automatic; water-to-carbide; contact.
The generating plant made by this firm comprises two or more generating
vessels _B_ in which carbide is contained in removable cases
perforated at different levels. Water is supplied to these generating
vessels, entering them at the bottom, from an elevated tank _A_
through a pipe _C_, in which is a tap _F_ connected by a lever
and chain _L_ with the bell _G_ of the equalising gasholder
_H_, into which the evolved gas passes. The lever of the tap
_F_ is counter-weighted so that when the bell _G_ descends the
tap is opened, and when the bell rises the tap is closed.
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