Plain concrete for farm use, farmers' bulletin no. 1279 (1922)
U. S. Department of Agriculture · U.S. Department of Agriculture · leaf 4
he whole is thoroughlymixed. Set the jar aside and allow the contents to settle. The sandwill settle to the bottom with the clay and loam on top of it. Ifmore than three-eighths of an inch of clay or loam shows, the sandshould be rejected or washed. The difference in fineness and colorshows clearly… … APPROX. 13-O ■ ELEVATION k i ,SHE.£.7 METAL **5i 1 2X 12 PL AN K S ^. V J v- 4 T 2 PLANKS-- 1 J 1 PLAN Fig. 1.—Sand and gravel washing trough. with one end higher than the other. On the lower end and sidesnail 2 by 6 inch boards. Spread the sand over the platform in alayer 3 or 4 inches thick and…
