Spon, Ernest, Haldane, Robert, Lock, Charles G. Warnford (Charles George Warnford), 1853-1909 · London ; New York : E. & F.N. Spon · leaf 198
s, or hour — illustrating the probable fact any of the material above mentioned, that the velocity of the water corre- 4 in. deep; and upon this a stratum of sponds with the depth of the filtering fine, clean sand 0 to 12 in. in depth. material for equal purity. Such a filter should be cleansed at… … a (ilter jdaced iu a position for easy filtering. Thi; iiiiie and fittings 8ho>ild cleaning. The recess at the bottom be of galvanised iron; black or \A\\\\\ may be covered with a j)erforatcd plate iron in better as long as it lasts, of galvanised sheet iron, upon which a.s it rusts f;i.st ; in…
Workshop recipes · Technology · Industrial arts
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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