A
charge of carbide is then tipped into the funnel and drops into the water
in the generating tank. The valve is then closed and the gas evolved goes
through the pipe _G_ to the gasholder, whence it passes through a
purifier to the service-pipe. There is a sludge-cock on the generating
tank.
[Illustration: FIG. 33.--NON-AUTOMATIC GENERATING PLANT OF DE SMET VAN
OVERBERGE.]
_Maker_: SOC. AN. BELGE DE LA PHOTOLITHE, 2 RUE DE HUY, LIEGE.
_Type_: Automatic; carbide-to-water.
The "Photolithe" generating plant made by this firm comprises an
equalising bell gasholder _A_ in the tank _O_, alongside a
generating tank _B_ which is surmounted by a carbide storage
receptacle divided into a number of compartments. These compartments are
fitted with flap bottoms secured by catches, and are charged with
carbide. Through the middle of the storage receptacle passes a spindle,
to the upper end of which is attached a pulley _b_. Round the pulley
passes a chain, one end of which carries a weight _n_, while in the
other direction it traverses guide pulleys and is attached to a loop on
the crown of the gasholder bell. When the bell falls below a certain
point owing to the consumption of gas, it pulls the chain and rotates the
pulley _b_ and therewith an arm _d_, which liberates the catch
supporting the flap-bottom of the next in order of the carbide
compartments.
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