ore use. to the ordinary gravity sand filter bed The many towns whose sewage find its as constructed in England and in the United States. Historically this sys- way directly or indirectly into the Thames, like Oxford and Reading, are tem of purification has the precedence, because its use has grown… … A SEVENTEEN-FOOT JEWELL GRAVITY FILTER. panies were compelled to abandon direct the board, and are not allowed to ex- pumpage from the Thames below Ted- ceed a certain maximum amount of im- dington Lock, until the present era, purity,"in their effluent sewage water. f In like manner, the numberless…
Engineering
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