When the bell falls, owing to the
consumption of gas, to a certain low position, the carbide chamber, which
has been brought by the rotation of the pulley over the shoot, is opened
at the bottom by the automatic liberation of a catch, and its contents
are discharged into the generating tank. The contents of one carbide
chamber suffice to fill the gasholder to two-thirds of its total
capacity. The carbide chambers after filling remain hermetically closed
until the bottom is opened for the discharge of the carbide. There is a
sludge-cock _G_ at the bottom of the generating tank. The gas passes
from the gasholder through a purifier _H_, which is ordinarily
charged with puratylene.
[Illustration: FIG. 32.--AUTOMATIC GENERATING PLANT OF DE SMET VAN
OVERBERGE.]
(2) Non-automatic; carbide-to-water.
This apparatus comprises a storage bell gasholder _J_ placed
alongside a generating tank in the top of which is a funnel _E_ with
a counter-weighted lever pivoted on the arm _B_. The base of the
funnel is closed by a flap valve _C_ hinged at _D_. When it is
desired to generate gas the counter-weight _A_ of the lever is
raised and the valve at the bottom of the funnel is thereby opened.
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