The bell of the
equalising gasholder is weighted or balanced so that when it rises to a
certain point the pressure is increased to a slight extent and
consequently the level of the water in the displacement controlling
chamber is lowered. In this chamber is a pipe perforated at about the
water-level, so that when the level is lowered through the increased
pressure thrown by the rising gasholder the water is below the
perforations and cannot enter the pipe. The pipe leads to the water
inlet-orifices of the generating tanks and when the equalising gasholder
falls, and so reduces the pressure within the controlling chamber, the
water in the latter rises and flows through the pipe to the generating
tanks. The water supplied to the carbide is thus under the dual control
of the controlling chamber and of the differential pressure within the
generating tank. The four generators are coupled so that they come into
action in succession automatically, and their order of operation is
naturally reversed after each recharging. An air-cock is provided in the
crown of the bell of each generator and, in case there should be need of
examination when charged, cocks are provided in other parts of the
apparatus for withdrawing water.
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