Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 672
tween the pipe and the filter is a stop-cock to close the communicationwhen necessaiy; there are also two drains, to carry off the foul water when the filters are being cleaned,and another to prevent the water from rising too high: when the filter is complete, its action is as fol-lows : The sluice… … 3 ^=^ ff work, unless very great pains are taken to wash the gravel and sand before they are put into the filter,which will now flow copiously for some weeks, and when the quantity passing begins to decrease, thestop-cocks are shut, and the valve S S raised. The water then enters below, filUng all…
Mechanical engineering
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