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Scientific American, Vol. 43, No. 26 (1880) (1880)
leaf 4
m four more filter beds. Inthe main aerated filter bed there are six layers, as follows: First, gravel stones or pebbles at the bottom, to allow free drainage; second, a layer of coarse gravel; third, one of finer gravel; fourth, one of sand; fifth, one of coarsely granulated charcoal and fine… … liar mechanism for converting the rotary movement of the as from that of commercial interests, as being in the nature DAY’S CISTERN. FILTER. of a fraud, in aiding the sale of articles which are not what | driving shaft into the reciprocating movement of the seed © 1880 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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