OBJECT-LESSON AND EXPEEIMENTAL ROADS, 1912-13. 25 



The outfit consisted of 4 drag scrapers, 2 Fresno scrapers, 1 wheel scraper, 

 one 8-horse road machine, 1 steel road drag, 1 plow, 1 disk harrow, 1 spike 

 harrow, and hand tools. Labor cost $2 and teams $4 per 10-hour day. 



The total cost of the road to the community was $1,663.15, which is at the 

 rate of $0,311 per square yard. The principal items of cost were as follows: 

 Excavation, at $0,158 per cubic yard, $120; shaping the subgrade, at $0,005 per 

 square yard, $28.20 ; loading gumbo, at $0,155 per cubic yard, $180.40 ; hauling 

 gumbo, at $0.60 per cubic yard, $698.80; spreading gumbo, at $0,029 per cubic 

 yard, $34 ; loading sand, at $0,105 per cubic yard, $93.60 ; hauling sand, at $0,336 

 per cubic yard, $299; spreading sand, at $0,012 per cubic yard, $10.60; mixing, 

 at $0,007 per square yard, $37.20; rolling, at $0.0025 per square yard, $13.60; 

 shaping, at $0,001 per square yard, $4 ; shoulders and ditches, $46.40 ; purchase 

 of gumbo pit, at $125 per acre, $41.35; miscellaneous, $14; and superintend- 

 ence, $42. 



SHELL ROADS. 



FoKT Myers, Pla. — A shell road leading from Fort Myers toward Punta 

 Rassa, known as the McGregor Boulevard, was begun on May 15, 1912, and 

 completed on December 11, 1912. This road was constructed in two sections — • 

 one section lying within the corporate limits of Fort Myers and paid for by 

 the municipality, and the other outside of the corporate limits and paid for by 

 the county. The land adjacent to the road is approximately level and the soil 

 is sandy throughout. 



The town section (water'bound) . — The town section was 7,200 feet long, and 

 was graded to a width of 28 feet outside to outside of shoulders or 36 feet between 

 curbs. The shell surface replaced an old surface of the same kind which had 

 become badly worn, and extended the entire length of the section. It was 16 feet 

 wide and the surfaced area was 12,800 square yards. The shell was spread 12 

 inches deep and compacted to 6 inches. The total amount of shell used was 

 3,838 cubic yards, all of which was purchased at a cost of $1.0203 per cubic 

 yard. Two hundred and five feet of vitrified clay culvert pipe, ranging in 

 diameter from 15 inches to 24 inches, was used. A reinforced concrete girder 

 bridge, having a span of 24 feet, a width of roadway of 24 feet, and a 6-foot 

 height of opening, was constructed at station 59. This bridge was constructed 

 by contract and cost $1,540. 



The total cost of the road, exclusive of the concrete bridge, was $6,539.36, 

 making a rate of $0,511 per square yard. The cost of labor was $1.50 per 10- 

 hour day and of teams $5 per day. The principal items of cost were: Clear- 

 ing, fine grading, and trenching, $579.60; scarifying the old road, $115.50; cul- 

 vert pipe delivered, $183.70 ; labor for pipe culverts, $70 ; surfacing material at 

 dock, $3,915.96 ; hauling the surfacing material from the dock to the road, 

 $1,186.35 ; spreading the surfacing material, $334.25 ; and rolling, $154. Wood for 

 fuel for the roller was cut by county convict force and the cost is not included. 



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

 hand tools. The average haul for shell was 1 mile and for water for the roller 

 i mile. 



The county section Cbituminons) . — The county section was 9,100 feet long and 

 had been partially graded before the object-lesson work was begun. The avail- 

 able cost data concerning grading were, therefore, not complete. The width 

 graded was 24 feet and the width surfaced 16 feet, making a total area of 24.267 

 square yards graded and 16,178 square yards surfaced. The shell was spread 

 to a depth of 14 inches in the center and 10 inches on the sides, and compacted 

 to 7 inches in the center and 5 inches on the sides. The shell was old and rotten 

 amd ranged in size from whole oyste? sheHs to small fragments. 



