Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 489
Fig. 1118. … Fig. 1119. carry off all the water from the centre. The width of a common road shouldbe 16 feet, slopes of about 8 inches to each side, grade not to exceed 9 to thehundred, or about 5°, and this not continuous, but broken by changes of grade.Fig. 1119 is a section of a gravel road similar to the…
Mechanical drawing
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