There is a sludge discharging tap _F_. With a view to the
ready dissipation of the heat of generation the generating chamber is
made rectangular and is placed in a water-tank as described. Some of the
heat of generation is also communicated to the underlying washer and
warms the water in it, so that the washing of the gas is effected by warm
water. Water condensing in the gasholder inlet-pipe falls downwards to
the washer. There is a water lip _H_ by which the level of the water
in the washer is automatically kept constant. The gasholder is provided
with a safety-pipe _K_, which allows gas to escape through it to the
open before the sides of the holder become unsealed, should the holder
for any reason become over-filled. The holder is of a capacity to take
the whole of the gas evolved from the carbide in one pan, and the water-
tank _B_ holds just sufficient water for the decomposition of one
charge of the generator. From the gasholder the gas passes through a
purifier, which is ordinarily charged with "Klenzal," and a baffle-box
for abstraction of dust, to the service-pipe. With plants intended to
supply more than forty lights for six hours, two or more generating
chambers are employed, placed in separate compartments of one rectangular
generating tank.
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