. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 4 BULLETIN 57, U. S. DEPARTMENT OF AGEICULTUEE. eartli or sand and lay the concrete and reenforcing on this cone. Allow it to set and harden well before removing the forms and earth. The followmg table gives an approximate bill of materials for two sizes of cisterns: Cisterns-— Material. [Concrete: 1 part cement, 2J parts sand, 5 parts gravel.] 14 feet ISJ feet deep deep (10-foot (10-foot cvlinder. cylinder. 4-foot 3.',-foot Material. cone), 8 feet in diameter, capacity 3,800 gallons. cone), 6 feet in diameter, capacit
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 4 BULLETIN 57, U. S. DEPARTMENT OF AGEICULTUEE. eartli or sand and lay the concrete and reenforcing on this cone. Allow it to set and harden well before removing the forms and earth. The followmg table gives an approximate bill of materials for two sizes of cisterns: Cisterns-— Material. [Concrete: 1 part cement, 2J parts sand, 5 parts gravel.] 14 feet ISJ feet deep deep (10-foot (10-foot cvlinder. cylinder. 4-foot 3.',-foot Material. cone), 8 feet in diameter, capacity 3,800 gallons. cone), 6 feet in diameter, capacity 2,100 gallons. Cement 43 31 Sand cubic 4i 3 Gravel do 9 1,000 225 6J Brick for filter wall. .. " . - 800 Lumber for forms board feet _ 200 The OfRce of Public Roads of this department has established a method of making concrete by intermixing mineral residuum oil,. Fig. 2.—Crib of brick or stone for intake from pond. which, according to theii- tests, makes a damp-proof and fairly water-tight concrete. Information may be obtained by writhig to that office for then- bulletin on oil-mixed Portland cement concrete.^ If water is piped from a stream or pond subject to pollution, the pipe entrance should be placed in a crib and screened, as shown hi iigure 2. The pipe can then empty mto a receiving filter, made of concrete, which contains fine sand, gravel, and powdered charcoal in layers (fig. 3), and from which it empties into the cistern. The rain-water pipe from the eave trough should be provided with a switch or cut-ofi", so that the flow may be diverted to the outside— as, for instance, for a short timt; at the beginning of rains^—to exclude the filth collected on the roof and gutters. An overflow pipe should be provided in the side of the cistern and should be screened to exclude rats and other vermin. »U. S. Dept. Agr., OflBce Pub. Roads Bui. Please note that these images are extracted from scanned page images that may have been digital
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