A sludge-
cock _P_ is provided at the bottom of the generating tank and is
stated to be available for use while generation of gas is proceeding. The
purifying material ordinarily supplied is "Roscoline."
[Illustration: FIG. 57.--"ROSCO" GENERATING PLANT.]
_Maker_: THE RURAL DISTRICTS GAS LIGHT CO., 28 VICTORIA STREET, S.W.
_Type_: Automatic; water-to-carbide; contact, superposed trays.
The "Signal-Arm" generating apparatus made by this firm comprises a bell
gasholder _A_, from the tank _B_ of which water is supplied
through a swivelled pipe _C_ to a generating chamber _D_. One
end of the swivelled pipe is provided with a delivery nozzle, the other
end is closed and counter-weighted, so that normally the open end of the
pipe is raised above the level of the water in the tank. A tappet
_E_ on the bell of the gasholder comes into contact with, and
depresses, the open end of the swivelled pipe when the bell falls below a
certain point. As soon as the open end of the swivelled pipe has thus
been lowered below the level of the water in the tank, water flows
through it into the funnel-shaped mouth _F_ of a pipe leading to the
bottom of the generating chamber.
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