There is a safety
lock to the hopper cap which prevents the feeding mechanism coming into
operation until the hopper cap is screwed down tightly. Provision is made
for a limited hand-feed of carbide to start the apparatus. The gasholder
is fitted with a telescoping vent-pipe, by which gas escapes to the open
in the event of the bell being raised above a certain height. There is
also an automatic cut-off of the carbide feed, which comes into operation
it the gas is withdrawn too rapidly whether through leakage in the pipes
or generating plant, or through the consumption being increased above the
normal generating capacity of the apparatus. The gas evolved passes into
a condensing or washing chamber placed beneath the gasholder tank and
thence it travels to the gasholder. From the gasholder it goes through a
purifier containing "chemically treated coke and cotton" to the supply-pipe.
[Illustration: FIG. 27.--"OMEGA" GENERATOR.]
1 Vent-cock handle.
2 Residuum-cock handle.
3 Agitator handle.
4 Filling funnel.
5 Water overflow.
6 Hopper cap and lever.
7 Starting feed.
8 Rocker arm.
9 Feed connecting-rod.
A Pawl.
B Lever for working feed mechanism.
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