66 BULLETIN 407, V. S. DEPARTMENT OF AGEICULTUEE. 



Experiment No. 5. — Cut-back Oil Asphalt, Mixing Method. 



From the west end up to station 12 + 50, with the exception of 

 that part opposite Hardenbrook Street, this section is badly worn 

 out and should be rebuilt. The part opposite Hardenbrook Street 

 is still in fair condition. From station 12 + 50 to the east end of the 

 section the pavement is fairly good, but the south half of it shows 

 considerable wear and the indications are that this part will need to 

 be rebuilt within a year. No work has been done on this section, 

 except that about six holes were repaired by the borough maintenance 

 crew during the past summer. 



Experiment No. 6. — Oil-Asphalt, Penetration Method. 



This section is practically in the same condition as indicated in 

 the last inspection report, except that the seal coat has worn until it 

 has entirely disappeared in some places. A shght waviness is develop- 

 ing along both sides over the entire length of the section. The narrow 

 strip where the seal coat had been picked up last year has healed and 

 is not visible now. 



Experiment No. 7. — Refined Coal Tar, Penetration Method. 



This section is still in good condition, with the exception of a strip 

 about 5 feet wide along the south side, where it is disintegrating 

 throughout its entire length. 



Experiment No. 8. — Fluxed Native Asphalt, Penetration Method. 



This section is apparently in the same condition as indicated in 

 the last inspection report, except for a small hole 1 foot long and 

 2 feet wide on the south edge at station 17 + 60. 



Experiment No. 9. — On. Asphalt, Penetration Method, 



This section appears to be in about the same condition as indicated 

 in the last inspection report, except that the narrow strip where the 

 seal coat was picked up has healed and is not now visible. 



In reference to this experimental road and the waviness which has 

 been developing along the sides of all of the bituminous sections, it 

 seems weU to call attention to the fact that this road was originally 

 built about 1895 as a plain macadam road 18 feet wide, and about 1905 

 it was reconstructed and surfaced for a width of 25 feet by widening 

 3^ feet on each side of the old road. It seems probable that the newer 

 part has not the depth of stone or was not as thoroughly compacted 

 as the 18 feet in the center. 



