26 BULLETIN 53, U. S. DEPAETMENT OF AGRICXJLTUEE. 



After this material had been spread and partially compacted, a thin bitumi- 

 nous biuder was applied to the surface cold, at the rate of oue-half gallon per 

 square yard, and left undisturbed until the next day. Shell fines and sand 

 were then spread over the bitui»en and the surface was rolled until thoroughly 

 compacted. The length of road treated with bitumen was 8,950 feet and the 

 area 15,911 square yards. 



Vitrified clay pipe, 168 feet by 24 inches, half-round corrugated iron pipe, 56 

 feet by 60 inches, and circular corrugated pipe, 32 feet by 48 inches, were used 

 in constructing culverts. 



The equipment consisted of a 10-ton roller, a road grader, slat-bottom wagons 

 of 2i cubic yards' capacity, and hand tools, and labor cost $1.50 per 10-hour 

 day for men and $5 for teams. The cost was distributed as follows: Clearing, 

 grading, and ditching (estimated), $1,800; wood for fuel for the roller, $150: 

 shaping the subgrade, 16,178 square yards, at $0.00644 per square yard, $104.25 ; 

 culvert pipe, $.595.88 ; labor on the culverts, $136.25 ; shell for surfacing, 5,608 

 cubic yards, at $1.0125 per cubic yard, $5,678.55; hauling the shell, 5,608 cubic 

 yards, at $0,446 per cubic yard, $2,499.75 ; spreading the shell, 5,608 cubic yards, 

 at $0.0678 per cubic yard, $380.25 ; sprinkling, 16,178 square yards, at $0.00513 

 per square yard, $83 ; rolling, 16,178 square yards, at $0.01845 per square yard, 

 $298.50; trimming the shoulders and ditches (41,000 feet), $175.75; bitumen, 

 8,089 gallons, at $0.09 per gallon, $728; demurrage on car, $81; hauling the 

 bitumen, $68; spreading the bitumen, 15,911 square yards, at $0.00613 per 

 square yard, $97.50; applying shell fines and sand, 15,911 square yards, at 

 $0.00778 per square yard, $123.75 ; and incidentals, $6. 



The total cost of the road to the community was $13,006.43, which is at the 

 rate of $0,804 per square yard. 



Annapolis, Md. — Several sections of road aggregating approximately 7,052 

 feet in length upon the grounds of the United States Naval Academy at 

 Annapolis were improved between April 17, 1913, and May 16, 1913. The land 

 adjacent to these roads is nearly level and the soil has been made by filling 

 with various materials, such as clay, brick, shells, etc. The maximum cut 

 and the maximum fill were each about 0.5 foot, since the grading was essen- 

 tially only a matter of correcting slight irregularities in the grade of the old 

 roads. The cost of labor was $1.28, and of 1-horse teams $2 per 8-hour day. 



The equipment consisted of one 45-ton tandem roller, one 10-ton macadam 

 roller, 1 spike-tooth harrow, 1 water wagon, one 2-horse grader, carts, picks, 

 shovels, etc. The average haul for excavation was 1,000 feet and the maximum 

 haul, 2,000 feet. The hauling was done in carts having about * cubic yard 

 capacity. Shell for surfacing was brought by water for a distance of about 

 40 miles and hauled in 25-bushel carts 800 feet from the scow to the road. It 

 was not necessary to provide any additional culverts or other drains on any 

 part of the work. 



The improvement consisted in shaping the old road, a considerable part of 

 which had been previously surfaced with shell, and constructing a new oyster- 

 shell surface. The wearing quality of the shell was apparently not very good. 

 The surfacing was done in seven .sections having the following dimensions, 

 length by width : 878 feet by 18 feet, 854 feet by 20 feet, 430 feet by 18 feet, 

 2,000 feet by 18 feet, 740 feet by 26 feet, 1,500 feet by 18 feet, and 650 feet by 

 15 feet, and the total area surfaced amounted to 11,935 square yards. The 

 depth to which the shell was spread varied from 2 inches to 13 inches, 

 measured loose, according to the condition of the surface, and the compacted 

 depth was about one-third the loose depth. Material to the extent of 1,037 

 cubic yards was moved in the excavation and 46,125 bushels of shells were 

 used in surfacing. In all, 24,300 bushels of shells were delivered on the road at 



