. 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. 162 AGRICULTURAL ENGINEERING The Construction of Stone Roads. As usually con- structed, the stone surfacing in a country road is made from 12 to 15 feet wide. The stone proper is usually applied in two layers, on top of which a third layer of stone dust or other binding material is used. The lower course is usually made from 2}4 to 4 inches thick, and the upper courses from 13/2 to 2 inches thick. Thus the
. 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. 162 AGRICULTURAL ENGINEERING The Construction of Stone Roads. As usually con- structed, the stone surfacing in a country road is made from 12 to 15 feet wide. The stone proper is usually applied in two layers, on top of which a third layer of stone dust or other binding material is used. The lower course is usually made from 2}4 to 4 inches thick, and the upper courses from 13/2 to 2 inches thick. Thus the total thickness of the stone varies from 4 inches to 6 inches at the center of the road, and from 2}^ inches to 4 inches at the outer edge. It is customary to apply more material in the center of the road, where the wear from traffic is the greatest, than at the outside. If automatic dump wagons are not used to spread the stone, it is generally recommended that it be applied with Fig. 85. Model of a water-bound macad- shovels. When Stone is am road. A represents the prepared sub- -, -t • i +V>^ grade. B represents the first course of QUmpeCl in UeapS, tne coarse stone. C represents the second i o ^^ j tv-vI! +r\ course of stone, and D the finishing layer larger iragmeniS TOll lO of stone, chips or dust. (Bui. 36, Office of +i nil+c;irlp of thp nilp Public Roads, U. S. Dept. of Agr.) ^ne OUlblUe OI iue pile and the finer portion is left in the center. The stone should be applied in layers of uniform thickness, making proper allowance for the shrink- age due to rolling. The packing is done with a steam roller. Horse rollers are not made heavy enough for this purpose; the ten-ton traction roller is the size in general use. It is customary to begin the rolling at the outside and work toward the center. After the lower course is thoroughly. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1919
