The open end of
the flexible tube is supported by a projection from the bell of the
gasholder, so that as the bell rises it is raised above the level of the
water in the tank and so ceases to deliver water to the generator until
the bell again falls. The water supplied flows by way of the water-seal
of the cover of the generating chamber to the cylinder containing the
carbide cage. Larger sizes have two generating chambers, and the nozzle
of the water delivery-pipe may be switched over from one to the other.
There is an overflow connexion which brings the second chamber
automatically into action when the first is exhausted. One chamber may be
recharged while the other is in action. Spare cylinders and cages are
provided for use when recharging. There is a cock for drawing off water
condensing in the outlet-pipe from the gasholder. The gas passes from the
holder to the lower part of a purifier with water-scaled cover, through
the purifying material in which it rises to the outlet leading to the
service-pipe. Purifying material under the proprietary name of the
"Allen" compound is supplied. The plant is shown in Fig. 44.
[Illustration: FIG. 44.--"ALLEN" FLEXIBLE-TUBE GENERATOR.
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