Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 658
of the water. The perforated tiles or plates are covered to the depth of 1 inch withclean gravel, about 3-10th of an inch in diameter; this is followed by five other layers of gravel, eachof the same depth, and each succeeding layer a little finer than the previous one, the last being coarsesand:… … mal charcoal, ground to the size of coarse meal, each particle about l-16th of an inch in diameter. Alongitudinal drain or pipe N runs between the filter and the pure-water basin, communicating withboth; on each of the openings between the pipe and the filter is a stop-cock to close the…
Mechanical engineering · Mechanics · Engineering
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