2 BULLETIN 53, U. S. DEPARTMENT OF AGRICULTURE. 
Area, in square yards, of object-lesson roads constructed, etc. — Continued. 
Material. 
1905 
1906 
1907 
1908 
1909 
1910 
1911 
1912 
19131 
10,831 
44,944 
51,246 
76,376 
72,587 
96, 107 
50, 333 
11,330 
578 
900 
9,774 
14, 806 
56,253 
4,819 
2,804 
2,607 
8,804 
4,197 
11, 722 
4,608 
65, 793 
71,376 
4,610 
177, 960 
59,942 
13,057 
63,730 
Sia<* 
19,178 
19, 443 
85,571 
42,634 
205,032 
218,177 
103, 876 
128, 496 
5,337 
400 
5,877 
3,392 
14, 020 
2,041 
1.&30 
Shell 
933 
12, 132 
"27," 042" 
40,646 
160. 932 
Earth 
85,967 319,456 
651, 109 
140, 933 
556, 663 
Total 
79,203 
87,951 
488,331 
1 Includes experimental roads. 
During the fiscal year 1912-13 the Office of Public Koads, under 
the general direction of the chief engineer, Vernon M. Peirce, and the 
immediate control of the highway engineer in charge, B. F. Heidel, 
supervised the construction of object-lesson roads as follows: One 
bituminous-concrete, 1 bituminous-macadam, 7 macadam, 4 gravel, 1 
gravel-macadam, 1 brick-cinder, 14 sand-clay, 1 sand-gumbo, 3 shell, 
and 9 earth. Three other roads begun during the past fiscal year 
were not completed, and the description of the work on them will be 
reserved for the next annual report. Exclusive of the assistance 
afforded by the office in the form of the salaries and expenses of its 
engineers, the object-lesson roads described below cost the various 
communities in which they were located $94,323.68. 
This bulletin includes, in addition to the object-lesson work of 
the office, a brief account of the experimental work for the past 
fiscal year, and reports of the bridge work and inspection of object- 
lesson roads as conducted under the immediate supervision of 
Charles H. Moorefield, highway engineer, and E. W. James, chief 
inspector, who report to the chief engineer. 
BITUMINOUS-CONCRETE ROAD. 
Chevy Chase Club, Md. — A driveway through the grounds of the Chevy Chase 
Club, approximately 1,395 feet long, was graded and surfaced with bituminous 
concrete on a broken-stone base between May 7, 1913, and June 28, 1913. 
Three days were lost on account of unfavorable weather and 12f days for 
other reasons. The road is 10 feet wide for a length of 150 feet, 15 feet wide 
for 945 feet, and from 20 to 23 feet wide for 300 feet, making a total area of 
2,807 square yards. Of this area 2,602 square yards were surfaced with bitu- 
minous concrete and 205 square yards with Portland cement concrete. The 
maximum cut was 1.5 feet, the maximum fill 0.5 foot, and the maximum 
grade remained 7 per cent. The adjacent land is rolling and the soil is mica- 
clay. The drainage structures had all been constructed before this work was 
begun and were paid for separately. 
