The cylinders receive tray carbide-containers
divided into compartments perforated at different levels so that they are
flooded in turn by the inflowing water. A weight _C_ carried by a
chain _D_ from one end of a lever _E_ pivoted to the framing of
the gasholder is supported by the bell of the gasholder when the latter
rises; but when the holder falls the weight _C_, coming upon the
lever _E_, raises the rod _F_, which thereupon opens the valve
_G_, which then allows water to flow from the gasholder tank through
the pipe _H_ to one of the generating cylinders. When the carbide in
the first cylinder is exhausted, the water passes on to a second. One
generating cylinder may be recharged while another is in action. The
rising of the holder, due to the evolved gas, causes the bell to support
the weight _C_ and thus closes the water supply-valve _G_. The
gas evolved passes through vertical condensers _J_ into washing-
boxes _K_, which are placed within the tank. The gas issues from the
washing-boxes into the gasholder bell, whence it is withdrawn through the
pipe _L_ which leads to the purifier. Puratylene is the purifying
material ordinarily supplied by this firm.
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