om four more filter beds. In the 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 A 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 CISTEBN EILTEK. of a fraud, in aiding the sale of article? which are not what j driving shaft into the reciprocating movement of the se6d they are represented to be. The…
Improved · Patented · Oil · Novel · Patents · Scientific American · Rubber · Wood working · Steam engine · Sewing machine · Filter bed · Hudson river · American institute · Compressed air · Electric light · Professor watson
Internet Archive · Public domain (published before 1931). Free to use for anything.
