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



blade was tough and pliable. The section will not require repairs to 

 keep it in serviceable condition, but should the other sections be re- 

 constructed the depressions in this section ought to be brought to 

 grade. 



SUPPLEMENTARY REPORT OF EXPERIMENTS MADE AT YOUNGSTOWN, 



OHIO, 1S09. 



SLAG, SLAG AND LIME, SLAG AND WASTE SULPHITE LIQUOR PREPARATION, AND SLAG 



AND TAR. 



The original report of these experiments was published in Circular 

 No. 92; and reports of annual inspections were given in Circulars Nos. 

 94, 98, and 99, Office of Public Roads, and U. S. Department of Agri- 

 culture Bulletin No. 105. The following report covers an inspection 

 made October 26, 1914, after a period of about 10 days' rain: 



Section No. 1 (Blast-Furnace Slag). 



A length of approximately 65 feet of this section, beginning at the 

 south curb of Mahoning Avenue, has been 'surfaced with a bituminous 

 paving material and serves as an intersection apron to that avenue. 

 Beyond the end of this pavement the section has not been disturbed, 

 and it is in generally good condition. The ruts have become well de- 

 fined, but they are shallow and wide, except for three depressions 

 about 30 inches long in the west rut. In these depressions the binder 

 has disappeared from the surface interstices of the stone of the wear- 

 ing course, but the stones do not appear to have been loosened. The 

 surface is otherwise smooth, uniformly worn, and free from large 

 protruding stones. 



Section No. 2 (Blast-Furnace Slag and Lime). 



Wide shallow ruts extend the entire length of the section, and a 

 few large stones about 3 inches in diameter protrude about one-half 

 inch above the general surface. Aside from these, the section has a 

 clean-cut appearance and does not appear badly worn. 



Section No. 3 (Blast-Furnace Slag and Waste Sulphite Liquor Preparation). 



The ruts referred to hi the two preceding sections continue un- 

 broken to the top of the slight grade near the middle of section No. 

 3, and there is no noteworthy difference in appearance between this 

 and the preceding section. About the same number of large pieces 

 of slag protrude from a unit of area, and there is no visible difference 

 in wear. From the middle of the section down the grade to the be- 

 ginning of section No. 4, neither the ruts nor the protruding stone 

 are as pronounced as in the north half of the section. 



