The purified gas now passes to a gasholder (sometimes known as a gasometer), which may be either single lift, i.e.
The tank for the gasholder is usually made by FIG.
In the year 1892 the largest existing gasholder was built at the East Greenwich works of the South Metropolitan Gas Company; it has six lifts, its diameter is 293 ft., and when filled with gas stands 180 ft.
The governor consists usually of a bell floating in a cast iron tank partially filled with water, and is in fact a small gasholder, from the centre of which is suspended a conical valve controlling the gas inlet and closing it as the bell fills.
I is a hydraulic box with water seal; j, a coke-scrubber; k, a filter; 1, a sawdust-scrubber; m, inlet of gas-holder; n, gasholder; o, outlet of same; p, a valve with weighted lever to regulate the admission of steam to the gas-producer; q, the weight which actuates the lever automatically by the rise or fall of the bell of the gas-holder.
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