The evolution of the gas
in the latter causes the bell to rise and the conical lining to be lifted
out of the water, the level of which thereupon falls below the mouths of
the pipes _E_ in consequence of the reduced displacement of the
bell. The supply of water to the generators is thus cut off until the
bell again falls and the level of the water in the tank is raised above
the mouths of the pipes _E_. The generating chambers _D_ are
provided with movable cages _F_ in which the carbide is arranged on
trays. The gas evolved travels through a scrubbing-box _G_
containing charcoal, and the pipe _J_ with drainage-pipe _P_ to
the water-seal or washer _K_ inside the holder, into which it then
passes. The outlet-pipe for gas from the holder leads through the
condensing coil _L_ immersed in the water in the tank to the
condensed water-trap _N_, and thence by the tap _Q_ to the
supply-pipe. The generating chambers are water-jacketed and provided with
gauge-glasses _H_ to indicate when recharging is necessary, and also
with sludge-cocks _M_. The object of the displacement cone in the
upper part of the bell is to obtain automatic feed of water to the
carbide without the use of cocks or movable parts.
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