Exhibit of the Office of Public Roads Alaska Yukon Pacific Exposition
Exhibit of the Office of Public Roads Alaska Yukon Pacific Exposition
United States Public Roads Administration
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Section D illustrates the finished road, smooth and firm and well crowned, the slope being 1 inch to the foot.
The burnt-clay road, which is confined to the Mississippi Delta States where stone and gravel is scarce and " gumbo " or " buckshot " < Inv plentiful, is never muddy in winter unless mud be carried to it from other roads.
Farmers' Bulletin No. 311, " Sand-clay and Burnt-clay Roads, " gives full information about this type of highway, if more be desired.
OILED EARTH ROADS.
< Plate IX. Fi. 1. ) This model shows the construction of an oiled earth road, the type now popular in the California orange belt.
Section A shows the dusty road before improvement.
Section B shows the road plowed to a depth of 6 inches.
Section C illustrates the application of oil to the plowed road.
Section D shows the road after being harrowed and the oil worked into the loose soil.
Section E shows the completed road after having been thorough!}- rolled, the crown representing a slope of three-fourths inch to the foot.
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