Interlocking levers, (11) and
(12) in the figure, prevent the opening of the feed valve while the cap
(10) of the carbide hopper is open for recharging the hopper. There is a
stirrer actuated by a handle (9) for preventing the sludge choking the
sludge cock. The gas passes into the gasholder through a floating seal,
which serves the dual purpose of washing it in the water of the gasholder
tank and of preventing the return of gas from the holder to the
generating tank. From the gasholder the gas passes to the filter (6)
where it traverses a strainer of closely woven cotton felt for the
purpose of the removal of any lime.
[Illustration: FIG. 25.--"COLT" GENERATING PLANT.]
Drip pipes (30) and (31) connected to the inlet- and outlet-pipes of the
gasholder are sealed in water to a depth of 6 inches, so that in the
event of the pressure in the generator or gasholder rising above that
limit the surplus gas blows through the seal and escapes through the
vent-pipe _C_. There is also a telescopic blow-off (32) and (33),
which automatically comes into play if the gasholder bell rises above a
certain height.
_Maker:_ DAVIS ACETYLENE CO., ELKHARDT, INDIANA.
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