Burlington weekly free press. [volume] (Burlington, Vt.) 1866-1928, 1908-10-01
(CONTINtlD.)

(CONTINCID.)
WATER GAS TAR EXPERIMENT
NO. l.
This trial was In direct contrast with
No. 3, section of road 1875 feet in
length and L. feet in width being treated
The area was 200 square yards In the
treatment Of which the dust and accu-
mulated matter was swept and the sur
face was clean. Because the work was
very small the tar was run from the
barrels onto the surface and II was then
worked In thoroughly with push brooms.
the quantity being O25 Of a gallon Of tar
to the square yard. which was less than
applied in No. s. The results were found
to be that tho removal Of the dust
made a surface that was roughcr and
not so smooth and comfortable to ride
over. AMI while there was no dust per
ceptihle, even after three months OF
wear. there was not evident the cush-
ion of rsaturated dust which was to
be noted In examination OF No. 3 and
| 1t was regarded that there were these
two aspects to be offered as to results
aside from the dustless quality. With
this the cost was l.3 cents for labor. 6,S
cents for material IL cents for removal
Of the sweepings. making O total cost
| of 3.3 cents square yard. 1t will be
noted that the expense OF removing the
sweepings and the additional labor Of
cleaning considerably increases the to-
tai cost.
COAL TAR EXPERIMENT NO. 5.
For the application Of coal tar the
road chosen for the experiment No. s
was about In the condition as It was for
No /. there being much need OF repair
and the surface being badly rutted and
in places broken through. while there
were numerous holes and depressions to
| be filled. After the road had been thor
| oughly swept the holes were patched
with care and then the coal tar, heated
to temperature OF $50 degrees in the
tar kettle, was spread upon the road
from the kettle. through a hose connect
ed to a drawoff. 1t being necessary to
move the kettle along the road in adj
vance OF the workmen, q team OF horses
was employed for that purpose. and as
the tar wash spread It was broomed In
to the surface while It was hot and was
worked into the voids very thoroughly.
| The number OF men necessary to do
this work was larger because four men
were needed TO broom the tar into the
road. while the foreman supervised the
work and drew the tar from the kettle.
1t first found desirable to outline
the width OF the road to be treated by
cords streached from stakes driven at
the side Of the road. but after the work
men became experienced this detail was
hardly thought necessary The tar. as
soon as spread. or Mt least during tho
same day. was covered with n dressing
OF gravel. which was later rolled with a
steam roller.
While It was possible to obtain a
smooth and even surface. the surfacing.
probably because Of the tar not having
set TO the extent 1t did later. was In
clined to wave under the roller when
the patches were large, and in some In
stances picked up but elsewhere the ad-
hesion to the road surface was excel
lent. A few days after the experiment
was made the road was practically dust
les1 and three months later It was free
from dust in any form and to consid
cradle degree resembled asphalt. Th'
roughncss OF the places patches wa!
probably due to the failure OF the void,
in the patches to be filled from the traf
flc before. the application. Under storm
the road was quite as satisfactory, 4
having drainage that quickly freed TIT
surface from water and II dried rapid
ly following storm. In this treatmen
section 10 feet was treated. Is feet II
width. this requiring 06 gallons of tar
The cost was 1873 cents a square yard
OF which 81 cents were for labor 9
cents for tar. 0.S cents fo- gravel, ..
cents for repairs and l cent for remova
OF the sweepings. II was noticeable 1,
= the treatments were the road was clean
: ed that the more sweepings we're re
= moved than covering or dressing wa
$ added, and It held good In this case
, the $50 square yards Of surface requir
ing two cubic yards Of gravel and from
I the surface two and quarter cubi
= yards of gravel was removed
COAL TAR EXPERIMENT NO. 6.
= In this the section OF the highway wa
e 600 feet In length and Is feet In width
e The road was treated for the application
t In precisely the same manner as IN Nc
= s, and when this had been done tn
first attempt was to utilize cold tar. bu
t 1t was found that the material was no
d only more difficult to handle. but It wa
:. not absorbed by the road surface. No
only this. but the tar could not be wei
d worked into the road with the pus
II brooms. The tar was heated to a tenn
Q perature OF las degrees before was foun
d q point at which It could be well dis
:. tributed and worked and at that hea
d could be regarded as giving equally goo
results as In No. s. But II was foun
4 that slightly larger quantity OF Ia
It was required to square yard. Til
o same experience was the result fror
10 the patching. this giving rougher sur
IA face than what had been merely swcn
a clean. Because Of the cost Of labor be
70 ing lower the net expense for this wor
was the same as In No. g. though IN
y amount of material was somewha
" larger. The tar required was OF gallon
e for a square yard and the cost was a
'r follows; Labor. Sc cents; tar, 2s cents
'e gravel, os cents; repairs, 2s cents: re-
HAova OF swesnipIa. cant. tina lot.