Principles and practice of butter-making . for potablepurposes. The filtering-can was made from 22 galvanized height of can is 48 inches; diameter, 18 inches. The bottomof the can is slanting towards the faucet, or opening. Thusno water is permitted to stand on the bottom and afford oppor-tunities for germs to accumulate. On the inside are three lies horizontally, near the bottom, and upon it the filtering-material rests. Another Hes on the top of the fine sand. Bothof these plates were perforated with many small holes. Near thetop is placed a concave plate with a hole near
Principles and practice of butter-making . for potablepurposes. The filtering-can was made from 22 galvanized height of can is 48 inches; diameter, 18 inches. The bottomof the can is slanting towards the faucet, or opening. Thusno water is permitted to stand on the bottom and afford oppor-tunities for germs to accumulate. On the inside are three lies horizontally, near the bottom, and upon it the filtering-material rests. Another Hes on the top of the fine sand. Bothof these plates were perforated with many small holes. Near thetop is placed a concave plate with a hole near the center. Thisplate directs all the water to the center of the filter-bed, and thusthe water gets the full benefit of the filtering process. The 268 CHURNING AND WASHING BUTTER total cost of this filtering-can when complete was $ Sincethe time when this can was constructed prices have advancedconsiderably. (3) The rate of filtration is necessarily governed by the depthof the filter-bed, the character of the material used, and its. Coai-sse gravel S&y<fe°o°i§5^» r^ d^; Gravel ^%°^o°Jo?3°^^°oooCoarse gravel/^c^6§aoc|S2
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisheretcet, bookyear1922
