66 BULLETIN 407, U. S. DEPARTMENT OF AGRICULTURE. 
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 slight 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. — Oil 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 well 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. 
