. Bulletin of the Department of Agriculture. Agriculture; Agriculture. DUST PREVENTION AND EOAD PRESERVATION, 1916. 41 Table 46.—Analysis of residual asphaltic petroleum * used in surface treatment of Bradley Lane. Specific gravity, 25°/25° C 0. 993 Specific viscosity, Engler, 100° 0., 50 c. c 13. 5 Float test at 50° C, seconds 28 Loss at 163° C, 5 hours, 20 grams, per '. 13. 71 Float test on residue, 50° C, seconds 151 Per cent of total bitumen insoluble in 86° B. naphtha 18. 63 Per cent fixed carbon 11. 25 Bitumen soluble in CS2 (total bitumen), per cent 99. 89 Organic matter inso
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. DUST PREVENTION AND EOAD PRESERVATION, 1916. 41 Table 46.—Analysis of residual asphaltic petroleum * used in surface treatment of Bradley Lane. Specific gravity, 25°/25° C 0. 993 Specific viscosity, Engler, 100° 0., 50 c. c 13. 5 Float test at 50° C, seconds 28 Loss at 163° C, 5 hours, 20 grams, per '. 13. 71 Float test on residue, 50° C, seconds 151 Per cent of total bitumen insoluble in 86° B. naphtha 18. 63 Per cent fixed carbon 11. 25 Bitumen soluble in CS2 (total bitumen), per cent 99. 89 Organic matter insoluble, per cent 08 Inorganic matter insoluble, per cent 03 Total 100. 00 Table 47.—Materials and cost data for surface treatment in 1916. Area treated square 6,788 Quantity of material per square yard: Bituminous material Gravel. cubic 0113 Cost per square yard (cents): Bituminous material Gravel 2. 90 Cleaning surface .28 Hauling materials '. 82 Applying bituminous materials .80 Applying sand and gravel .42 Supervision .62 Total 7. 99 Table 48.—Surface maintenance costs of 1915 experiments, Bradley Lane, Montgomery County, Md.,from Jan. 1 to Dec. 31, 1916. Length of section. Area. Cost per square yard. Mainte- Experiment No. Construc- tion. Mainte- nance. Total. nance cost per mile. 1 Feet. 3,614 200 Sq. yards. 6,421 367 Cents. Cents. \ Cents. 2 2 $ Table 49.— Volume and character of traffic on Bradley Lane, Jan. 1 to Dec. 30, 1916. Twenty-four-hour period. Maximum. Loaded 1-horse wagon Unloaded 2-horse wagon Loaded 2-horse wagon Unloaded 2-horse wagon Loaded 4-horse wagon Unloaded 4-horse wagon One-horse pleasure Two-horse pleasure vehicle. Rubber-tired horse Saddle horse Motor cycle Excessively heavy vehicle3. Motor runabout Motor touring car Loaded motor dray Unloaded motor dray 1 Viscous, sticky fluid. 2 Width of surfacing taken as 16 feet. 8 Very heavy vehicles,
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