22 BULLETIN 105, U. S. DEPARTMENT OF AGRICULTURE. 
Details. — Car No. 1 began to foam badly from water contamina- 
tion after the first two loads had been applied. About 2,000 gallons 
were used, when, owing to the difficulty of handling the material, the 
remainder of the shipment was rejected and replaced b}^ car No. 2. 
From station 314 + 10 to station 320 + 70 and from station 294 to sta- 
tion 308 the oil was applied soon after a rain while the surface of the 
macadam was still moist. 
Experiment No. 6. — Water-gas tar preparation — Hot application. 
Location: From station 347+75 to station 4114-00. 
Length: 6,325 feet. 
Date of application : November 24 and November 26. 
Temperature of tar: Maximum 248° F.; minimum 180° F.; average 214° F. 
Table 26.' — Analysis of water-gas tar preparation 1 used in experiment No. 6. 
Specific gravity 25°/25° C 1; !5 
Float test at 32° C. (time) 2'9" 
Per cent of free carbon 1_ 29 
Distillation: By volume. By weight. 
Water per cent . . 0. 0. 
First light oils to 110° C do 2.2 .1 
Second light oils 110°-170° C do 2. 2 .2 
Heavy oils 170°-270° C do. . . . 2 jg. 7 14 9 
Heavy oils 270°-315° C. 3 do 4 7. 5 p. q 
Pitch residue do 75. 4 7S. 1 
Total do.... 100.0 99.9 
Details. — The east hah of the road from station 393 + 60 to station 
397 + 60 was treated by means of hand-pouring pots. 
Experiment No. 7.- — Asphaltic petroleum — Cold application. 
Location: From station 4114-00 to station 4774-89. 
Length: 6,689 feet. 
Date of application: December 4 and 5. 
Temperature of oil: From 80° to 100° F. 
Table 27.- — Analysis of asphaltic petroleum'" used in experiment No. 7. 
Specific gravity 23725° C 0. 959 
Flash point ° C 32 
Burning point ° C 41 
Viscosity, Engler, 25° C, 50 c. c. specific 114. 5 
Per cent of loss at 163° C, 5 hours (20 grams) 27. 44 
Float test of residue (50° C.) i 1'53" 
Per cent of total bitumen insoluble in 86° B. naphtha 7. 38 
Per cent of fixed carbon 4. 28 
Per cent soluble in CS 2 (total bitumen) 99. 91 
Per cent of organic matter insoluble 03 
Per cent of inorganic matter insoluble - 01 
Total 100.00 
i Sticky, very viscous fluid. • 
2 Clear. 
3 A 315°-350° C. fraction showed 5 per cent and a 350°-375° C. fraction showed 10 per cent insoluble in 
dimethyl sulphate. 
4 Clear; showed 5 per cent insoluble in dimethyl sulphate. 
5 Sticky, fluid, with strong naphtha odor. 
