It
flows out of the supply-pipe near the top of the generating chamber
through a slot in the side of the pipe facing the corner of the chamber,
so that it runs down the latter without splashing the carbide in the
upper pans. It enters first the lowest carbide pan through the
perforations, which are at different levels in the side of the pan. It
thus attacks the carbide from the bottom upwards. The evolved gas passes
from the generating chamber through a pipe opening near the top of the
same to the washer _A_, which forms the base of the generating tank.
It bubbles through the water in the washer, which therefore also serves
as a water-seal, and passes thence to the gasholder. On the bell of the
gasholder is an arm _C_ which, when the holder descends nearly to
its lowest point, depresses the rod _C_, which is connected by a
chain to a piston in the outlet-pipe from the water-tank _B_. The
fall of the gasholder thereby raises the piston and allows water to flow
out of the tank _B_ through the tap _D_ to the funnel _E_.
The generating tank is connected by a pipe, with tap _G_, with the
washer _A_, and the water in the generating tank is run off through
this pipe each time the generating chamber is opened for recharging,
thereby flushing out the washer _A_ and renewing the water in the
same.
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