60 BULLETIN 586, U. S. DEPARTMENT OF AGRICULTURE. 
Section No. 7, A and B—Oul asphalt, penetration method.—Section 
A continued distinctly more mosaic than B and required a little patch- 
ing. Section B had the aggregate exposed in numerous spots along 
the east half and needed somewhat heavy patching in the spring, to 
go through the season. ‘The west half toward the trolley tracks was 
much better and less moisture appeared through the surface than near 
the gutter. 
Section No. 8—Refined water-gas tar preparation, surface treat- 
ment.—During the past summer experiment No. 8 was re-treated with 
the same type of bituminous material as used in previous treatments, 
and the section appeared to be better than is usual in winter. The 
recent treatment, however, wore away in small areas, exposing the 
smooth surface of earlier treatments beneath. ‘There were no breaks 
in the surface, and the wear since the last re-treatment has been uni- 
form with the surface, smooth and regular. This experiment indi- 
cated need of re-treatment in the summer. The cost of the re-treat- 
ment is given in table 65. 
Section No. 9—Asphaltic petroleum, surface treatment; Section No. 
10—Residual petroleum, surface treatment.—Section 9 was again 
re-treated during the past season. South of Kirke Street the east 
half of the section was wet and rough, but the rest of the section was: 
better than is usual at the time of inspection, and presented a gener- 
ally smooth surface, except for waviness on the east one-third. 
It seemed probable that the section would require another treat- 
ment. ‘Table 64 gives an analysis of the bituminous materials used in 
re-treating sections Nos. 9 and 10, and the cost of re-treatments appear 
in Table 65. 
Both ends of section No. 10 were rather better than usual at this 
season of the year but the middle one-third was bad, having developed 
the characteristic pot-holes at more or less regular intervals, owing 
apparently to the rhythmic impact of automobile traffic. 
TABLE 64.—Analysis of asphaltic petroleum used in retreatment of sections 9 and 10. 
Specilic oravaby 20/20! cea hee. ei Ay gk ioe eee rere 0. 952 
TNS) or oot ot mA CoN Oy) Reis pase A te Dali 5 Sms ees ere eae Rees ine! anon 18 
IB UPMINe WONG (oOo) nee cae eye Sat ek RE S.A orca rte cree em 30 
Specifichvascosiby, vHngler/50iene. Map ameeeee~ 25S ee Co aen See een oe 90. 9 
assiabi63°.C..\5vhours:,20/erams.)pericent.<.Lt ae eae pea te eat sey he ee 24. 42 
loatitestoniresidueso02iC: “seconds apeener). oer eae Coen epee ee eee ee 118 
Per cent of total bitumen insoluble in 86° B. naphtha.....-............------ 10. 47 
hercenbiixed carbons. 822) ./k0 vo. Geet: oma ey treatises) meee Ele 4.50 
Bilmen soluble GS; (totalibitumen) sees. een eee cess ae 99. 92 
Oreanic matteransoluplers 2.2 os ot Ae.) ys, See ene ye 2 me pone . 05 
inorganicmatter ansoluple se: oo 252205 Ree a. omic a eRe ane eajeie ioe sae . 03 
