30 BULLETIN 257, U. S. DEPARTMENT OF AGRICULTURE. 



The surface was swept by means of a rotary broom drawn by the 

 automobile distributor, which applied the bituminous material. The 

 application was immediately covered with f -inch washed gravel, and 

 the road opened to traffic. The bituminous material is charged at the 

 rate of 6.6 cents per gallon, and sweeping and applying at 2.5 cents 

 per gallon. The cost data for the treatment are given in Table 24. 

 When inspected the surface was smooth and hard, with but few 

 irregularities. 



Section No. 2 (Repined Coal Tar — Modified Gladwell Method). 



This section, although presenting a well-bound surface, is irregular 

 and shows considerable wear, so that a surface treatment will be neces- 

 sary during the coming season. 



Section No. 3 (Fluxed Native Asphalt — Penetration Method). 



This section continues to present a smooth, well-crowned surface, 

 but during the past year the seal coat has worn so that at the present 

 time the surface has a mosaic appearance in some areas. There are 

 a few other areas, especially in the north half of the section, where 

 the seal coat is still intact, and no general treatment will be required 

 during the coining season. 



Section No. 4 (Gilsonite Oil Asphalt — Penetration Method). 



This section, although well bound together, has an irregular sur- 

 face, especially toward the gutter, so that it is rather rough under 

 automobile traffic. In the depressions the stones are generally 

 exposed, and probably considerable patching will be necessary in the 



spring. 



Section No. 5 (Oil Asphalt — Penetration Method). 



The appearance of this section has not changed appreciably since 

 the last inspection, described in U. S. Department of Agriculture 

 Bulletin No. 105. The surface is uneven, and in a few depressions the 

 stone is somewhat loose. No raveling has occurred, however, and 

 only minor repairs are now required. 



Section No. 6 (Oil Asphalt — Penetration Method). 



In general, this section has the same appearance as section No. 5. 

 At the north end and on the west side of the trolley tracks the grade 

 is 2 to 3 inches lower than that of the adjoining asphaltic concrete 

 experiment, and it will be necessary in the spring to bring the sur- 

 face to a corresponding grade. 



Section No. 7 (A and B; Oil Asphalt — Penetration Method). 



The appearance of this section is not uniform. A has quite a 

 mosaic effect, the northern portion of B has several small breaks 

 which will need patching in the near future, and the southern portion 

 has developed a few slight irregularities. 



