DUST PREVENTION AND ROAD PRESERVATION, 1914. 35 



At tlie time of the inspection the experiment was again in very bad 

 condition, and it appeared to be breaking up throughout its entire 

 length. Numerous potholes, extending through the full thickness 

 of the road, were forming, and the bituminous material appeared to 

 have lost its life. The easterly 50 feet, however, continued in 

 somewhat better condition than the remainder of the experiment. 



Experiment No. 3 (Fluxed Native Asphalt — Mixing Method). 



Except where openings have been made for house connections, 

 at about stations 5+40, 5 + 80, and 6 + 80, this section remains in 

 very good condition. The patches placed at the openings are now 

 somewhat below the original grade. Along the north side for the 

 last 30 feet and for a width of from 3 to 4 feet there are a few waves 

 about 3 feet long and 1 inch or less in depth. It is also possible in 

 wet weather to notice slight waves, perhaps not over one-sixteenth 

 inch in depth, extending entirely across the roadway. These were 

 evidently caused by the manner of pouring the seal coat at the time 

 of construction. 



Experiment No. 4 (Refined Coal Tar — Mixing Method). 



This section is in excellent condition except for the following 

 imperfections : The edges on both sides are a little wavy, the waviness 

 being more pronounced between stations 8 + 00 and 8 + 45 for a width 

 of 5 feet on the north edge and between stations 8+45 and 9+00 

 on the south edge for a width of about 10 feet. At station 9 + 54 a 

 pothole is forming on the north edge. The seal coat is gone from 

 stations 10 + 68 to 10 + 98 for a width of about 5 feet on the south edge. 

 At station 10 + 90, on the north side, a house connection was made and 

 as the work of restoration was not properly done, the pavement at 

 this point is not in first-class condition. 



Experiment No. 5 (Cut-Back Oil Asphalt — Mixing Method). 



A rut developed in this section during the winter of 1913-14, and 

 this, together with the holes reported in the last inspection report, 

 was repaired in May, 1914. The deeper holes were patched with 

 H-inch stone and hot refined coal tar, applied by the penetration 

 method at the rate of \\ gallons to the square yard. The rut was 

 patched with 1-inch stone, sand, and hot refined coal tar. 



At the time of inspection the surface of the following portions of the 

 experiment was found to be good: An irregular strip through the 

 center from 6 to 8 feet in width, the whole, intersection opposito 

 Hardenbrook Street for a width of about 35 feet, the smith side from 

 ions 13 I 00 to 13 I 23, and the north side from stations 1:2 + 50 

 to 13 94. Over the remainder of the experiment fche seal coat is 

 disappearing, and potholes are forming 1 . The whole section is wavy 



