The Washington herald. [volume] (Washington, D.C.) 1906-1939, 1912-09-08
COMPARATIVE TIRE
TESTS ARB MADE
Determine Amount of Gasoline Con-
sumed-Also Speed At
tanned.

Comparative tire tests made on June
10. 1872. at South Main Street. Akron Ohio.
by ]. D. Tew and O. F. wagonhurst, the
object being to determine the amount Of
gasoline consumed in each test, also speed
attained as well as coasting.
The hill selected was carefully meas
ured, elevations taken with an engineer
level to ascertain accurately the grades.
The course was about 5000 feet long; the
car used, a Peerless six-cylinder; size Of
tires in both cases 37x5" rear and 36xi"
front. The loading was the same; the
pressure in the tires was the same; prac-
tically the same time; weather clear, and
no wind blowing. The tires used were two
rnakes-Diamond Silvertown Cord and
Diamond Regular Wrapped Thread.
Coasting and Speed.
The car was first equipped with Silver
town Cord tires and was taken to the
summit Of the hill mentioned. standing
start was made-no power used. the en-
CINE being dead. A careful record of the
speed attained at each successive tenth
OF mile was made. and II Is to be noted
that at the first tenth the speed of the car
with the Siivertown tires was fourteen
miles per hour, while with the Fabric
tires at the same place the speed was nine
miles per hour, showing that the cord
tires gave an increased speed of IS per
cent at this point. At the second tenth
the speed attained by Silvertown tires
was seventeen miles per hour, as against
eleven and half miles per hour for Fib-
ric tires, showing an increased speed Of As
per cent At the third tenth the speed
attained by Silvertown tires was seven
teen miles per hour, as against eleven
miles per hour for Fabrics, again showing
an increased speed of 81 per cent At the
fourth tenth the speed attained by Silver
towns was sixteen and one-half miles per
hour, as against eight and one-haIf miles
per hour for Fabric tires, showing an in
creased speed at the fourth tenth of q
mile of "a per cent.
1t will be observed that the average
speed. therefore, attained by SiIvertown
Cord tires over fabrics was about s. per
cent on this particular coasting test.
The car equipped with fabric tires ran
40 of a mile plus 1S5 feet when It came
TO a full stop on the down grade OF ~
per cent At the place where the car
stopped with fabric tires the same car,
under identicaIIy the same conditions,
was running at the rate or IL l-z miles
per hour with cord tires. 1t continued
10 run on this a per cent grade so feet
farther; then 80 feet on the level grade,
nnlshing up on an upgrade or j per cent.
having run up this latter grade a dis
lance of l4s feet before coming to a ruIl
stop.
The distance Travelled by the car inl
each case was as follows:
Fabric tires ................ 2,297 feet
Silvertown cord tires ..... 2s4S
showing an increased distance Of 5i6 feet,
or about Is Clio per cent.
Gasoline Consumption Test-Silver-
town VS.. Fabric.
On the same date, and at practically |
the same time, comparison was made
between these two types or tires, regard
ing the amount OF gasoline consumed or |
covered by the same amount of
gasoline. The gasoline was carefully
measured, and the same rates OF speed
were used in running the car. as fol-
lows: The first four miles were run at
the rate OF ten miles per hour in twenty
two minutes which practically checks forl
the rate. The next six miles were run
at a rate of twenty miles per hour In
twelve minutes, showing that the rate
and time checked. The next $40 miles
were run al a rate or twenty-five miles
per hour in thirteen minutes, the rate
and time checking again. This test was
made with SfIvertown, and after running
ID $40 miles the gasoline was used up.
The tires were then immediately
changed and fabrics installed. The rates
OF speed were identicaIly the same, and
also with the time it was
found that the car with fabric tires only
ran twelve miles, when the gasoline again
gave out.
Tnis shows an increased mileage or ~
per cent for SiIvertowns over fabrics.
1t should be noted that the last 6-lU
miles on SlIvertowns were run at the
rate OF twenty-five miles per hour, while
the car only ran two miles at twenty-five
miles per hour with fabric tires. From
this 1t can readily be seen that had the
same speed been maintained throughout,
the mileage Of Sflvertowns fabrics would
probably have been increased ~ per cent.