DUST PREVENTION AND ROAD PRESERVATION, 1914. 19 
original construction left the road flat and inadequately drained. 
These are now showing the strain of more or less continued dampness | 
from underneath. The gravel section of this experiment has a 
markedly better appearance than the trap section. 
The surface of experiment No. 2 in Bradley Lane is in fairly good 
condition and free from bad holes or depressions. 
EXPERIMENT No. 3 (ASPHALTIC PETROLEUM—COoLD APPLICATION). 
‘The surface of this experiment also began to fail rapidly during the 
summer of 1914, and the failure seemed most pronounced at first on 
the section where rather coarse gravel had been used for a covering 
material. Moreover, during the winter of 1913-14, not only was the 
surface cut through because of culvert repairs, but several rather large 
areas heaved as a result of frost action. This latter damage was due 
to the partial burning out of some of the surfacing bitumen by bonfires 
set along the outer edge of the road. In a few places along the sides 
of the road the surface mat had cracked to some extent. 
A new treatment was therefore applied between September 23 and 
_ 27, in which the same grade and character of oil as that originally 
applied was used. The application was made by permitting the oil 
to run from the bung of the barrel and sweeping it over the surface 
with rattan push brooms. From station 135+00 to station 144+ 00, 
where the original surface was still fairly smooth and intact, the appli- 
cation was at the rate of 0.13 gallon per square yard, while over the 
remainder of the experiment it was at the rate of 0.18 gallon per 
square yard. The average was 0.176 gallon per square yard. The 
application was immediately covered with clean torpedo sand. 
Table No. 12 shows the characteristics of the bituminous material 
used, and the cost data will be found at the end of this supplementary 
report. 
TABLE 12.—Analysis of asphaltic petroleum. 
SI CEMIC Ora vbyM Om / LOO may ec Wee te Be ADD ie Cela a Nc pid es as id 0. 932 
Tig ishan TOON on esd ABN Vato can) ad Mh a Sea ce Mm aiatg Coed Mae ia aK cshig U0 Ole 35 
BuEmInepOINE sp) seh seks) os Payoh vs ook ays aide as cs en epi ae Cras 70 
NASCOStiyeBEMCleR A Ohes C2 at 20> Oo Specie! 60. 9t ss aes 61.9 
eosssoRMouTsatalioa Om. 20 cramss cs wie te ee ee per cent.. 22.94 
loatintesion residwerat-o2 Os (Gimme) ic Sos sis a se ia DBA 
iloatwtestionrestducrat 502 Cy. (time a5 ck Le et Sia ty aon ear ay MS D204 
Percentage of total bitumen insoluble in 86° B.naphtha.................... S767, 
Bicedicarbhomeac:ts224, v5 621024 Sian ee Bee ee PEMLS Ties Maes OU e aLe percent.. 7.62 
SoMMolemmeGse(total bitumen) s.24 ee ache NT dose 7799: 90 
Oreaniemuaersmsoluples:mesas os sae ee OME ee ey Pe doses zal 
irercaniesmatvenunsolublesyy spk th eles as ee els vy oe does. . 00 
WORE SA soars coe tech I i Re olen NM yy am hd es an do 100. 00 
