The Civil engineer and architect's journal, scientific and railway gazette (1839)
London : [William Laxton] · leaf 102
re inch upon its area,and it will lift and let out the water, until the descending columnbalances the weight of the valve; the cock / is for the purpose of blowing out any sediment which may have accumulated in the valvebox, this is done by depressing the rod g g, attached to the lever g,which is… … a pipe descends, and is connected with the suction-pipe of a pump,which may be either a bucket or force-pump; the exit valve orclack, is loaded by a weight and lever, like a safety-valve, with the sameobject as the water-valve already described, viz. that it may counteractthe pressure of the steam…
Architecture · Civil engineering · Science
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