The taps _G_ and _H_
serve to disconnect one of the generating chambers from the water-supply
during recharging or while another chamber is in action. The gas evolved
passes from each generating chamber through a pipe _L_, terminating
in the dip-pipe _M_, which is provided with a baffle-plate having
very small perforations by which the stream of gas is broken up, thereby
subjecting it to thorough washing by the upper layers of water in the
gasholder tank. The washed gas, which thus enters the gasholder, passes
from it through the pipe _N_ with main cock _R_ to the service-
pipes. The water-supply to the generator is controlled through the tap
_E_, which is operated by a chain connected to an arm attached to
the bell of the gasholder.
The water in the gasholder tank is accordingly made to serve for the
supply of the generating chambers, for the washing of the gas, and as a
jacket to the generating chambers. The heat evolved by the decomposition
of the carbide in the latter creates a circulation of the water, ensuring
thereby thorough mixing of the fresh water, which is added from time to
time to replace that removed for the decomposition of the carbide, with
the water already in the tank.
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