42 BULLETIN 105, II. S. DEPABTMEISTT OF AGBICULTTJEE. 



Section No. 1. — Repined coal tar — Penetration method. 



The section was not resurfaced since last inspected, and the 

 surface while not generally loose presented the appearance of a 

 plain macadam road which had been bonded largely by traffic. All 

 of the seal coat, with the exception of two small areas totaling 

 approximately 24 square feet, has been worn off. 



Section No. 2.- — Refined tar preparation — Penetration method. 



Approximately one-half of the seal coat has been worn off and this 

 section showed a rather uneven surface. A number of small raveled 

 places are in evidence, extending generally from the outside of the 

 main traveled way to the edges. The surface of this section has 

 been broken for numerous water connections and the stone replaced 

 hi a loose manner without even tamping, and this is thought to be 

 largely responsible for the general appearance of the surface. 



Section No. 3. — Oil asphalt — Penetration method. 



With the exception of the two small depressions noted in the 

 inspection of November 22, 1911, this section presented a smooth, 

 well-bonded surface, slightly mosaic in appearance. It could not 

 be dug into with a knife and gave a hard metallic ring under horses' 

 hoofs. The depressions were evidently due to settlement, and no 

 raveling has taken place. 



SUPPLEMENTARY REPORT OF EXPERIMENTS MADE AT YOUNGSTOWN, 



OHIO, 1909. 



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 are given in Circulars Nos. 

 94, 98, and 99. The inspection on which the following report is 

 based was made on September 1, 1913, and the sections are discussed 

 in the order of their section numbers, beginning at Mahoning Avenue. 



Section No. 1. — Blast-furnace slag; Section No. 2.- — Blast-furnace slag and 

 lime; Section No. 3. — Blast-furnace slag and waste sulphite liquor prepa- 

 ration. 



The wear on these three sections has been quite uniform. The 

 surfaces are well bonded and firm, and the crown is practically the 

 same as when the road was originally constructed. The only differ- 

 ence noted in any of these sections was that on sections Nos. 2 and 3 

 the No. 1 stone was more in evidence on the surface than in section 

 No. 1, and there were also very slight ruts in the traveled way. 



