The gas evolved passes through the pipe _O_ into the
condenser, which is packed with coke, through which the gas goes to the
pipe _E_ and so to the washer _P_ through the water, in which
it bubbles and issues by the pipe _G_ into the gasholder. The bell
_L_ of the gasholder is connected by a chain _C_ to the axis of
the drum _A_, on which is a pinion with pawl so arranged that the
pull on the chain caused by the fall of the bell of the gasholder rotates
the drum by 1/8 of a turn. The catch on the outside of the carbide
chamber, which has thereby been brought to the lowest position, is at the
same time freed, so that the contents of the chamber are discharged
through the funnel _B_. The evolved gas causes the bell to rise and
the drum remains at rest until, owing to the consumption of gas, the bell
again falls and rotates the drum by another 1/8 of a turn. Each chamber
of the drum holds sufficient carbide to make a volume of gas nearly equal
to the capacity of the gasholder. Thus each discharge of carbide very
nearly fills the gasholder, but cannot over-fill it. The bell is provided
with a vent-pipe _i_, which comes into operation should the bell
rise so high that it is on the point of becoming unsealed.
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