Mechanical movements, powers, devices and appliances (1901)
Hiscox, Gardner Dexter, 1822?-1908 · New York, N. W. Henley & company · leaf 165
tom,and a small flower-pot saucer inverted over the hole.Then fill in a layer of sharp, clean sand, rather coarse..:=. A layer of finer sand, a layer of pulverized charcoalwith dust blown out, then a layer of sand, the whole occupying one-third of the jar. 582. POROUS WATER FILTER.—The invert-ed…
Mechanical movements
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