. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. FARM MACHINERY 201. Fig. 110. Illustrating method of using a straight-edge to determine whether a plow has the proper "suc- ; it be not too great. With the proper amount of suction a plow will run evenly, as far as depth is concerned. To test for suction, lay a straight- edge on the underline of the landside when the plow is turned bottom side up. If there is an opening of about 3^8 of an inc
. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. FARM MACHINERY 201. Fig. 110. Illustrating method of using a straight-edge to determine whether a plow has the proper "suc- ; it be not too great. With the proper amount of suction a plow will run evenly, as far as depth is concerned. To test for suction, lay a straight- edge on the underline of the landside when the plow is turned bottom side up. If there is an opening of about 3^8 of an inch between the straight-edge and the landside at the joint between it and the share, the suction is about correct. To lift and bend the furrow slice, a certain amount of pressure must come upon the outer corner, or wing, of the share. To resist or carry this pressure, a certain amount of surface, or "bearing," is provided to rest upon the bottom of the furrow as the plow is drawn along. If this bearing is too great, the plow will be continually tending to turn out from the land, and if insufficient will turn in the opposite direction. The amount of bearing, or the width of surface at the corner of the share, varies with the condition of the soil, but l}/i inches is about correct for a 16-inch plow. The bearing sur- face is triangular in shape, and is usually about 3 inches long. Steel-beam walking plows have an advantage in clearance, and for this reason are more satisfactory in plowing under trash and weeds. On the other hand, wooden-beam walking plows are slightly lighter. Sulky or Gang Plows. Riding plows with moldboards may be divided into two classes, frame and frameless, and are constructed with and without tongues. The frameless and tongueless plows are of the cheaper construction; but,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1919
