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Scientific American, Vol. 88, No. 11 (1903) (1903)
leaf 3
main vals, so that their centers are 15 feet 10 inches apart. how the filtering of the water is done, the Torresdale The roof suppcrted by these piers consists of a series sewers, from three and a half to eight and a half plant will serve as an illustration, that being the of arches. The floor of… … 7?" = Entrance to Filter Bed. CR SS THE NEW PHILADELPHIA FILTRATION SYSTEM. © 1903 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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