The Colfax gazette. [volume] (Colfax, Wash.) 1893-1932, 1910-09-09
TIRE INITIATING
AND ADJUSTING
Air Pressure Should Agree With
Weight Of Gar.
WHAT REQUIREMENTS ARE

If Tires Are Inflated to a Low Pressure
RepIacements Cannot Be Expec+sd
From Manufacturers-How MANY
Tires Are Ruined.
Tire manufacturers are universally
agreed. after spending much time and
money experimenting and testing. that
certain air pressure should be MAIN
tatned In all tires according to the
weight they are to carry. The neces
sary minimum pressure is stated by
manufacturers to be as follows:
Pounds
pressure.
Three and one-half inch tire . 6o
-Four inch tire NEUTRALITY-SUSPICIOUS.. IL
our and one-half inch tire 70
Five inch tire Observation-Disclosures. :.
Five and one-half inch tire - .,
lnasmuch as tires are manufactured
and sold under guarantee for a GER
&6p mileage, the guarantee is based
the understanding that they will be
sept up to this pressure at all times.
and number of makers attach label
quired pressure for that particular size
of tire. If. therefore, cars are run with
tires inflated to a lower pressure re-
placements cannot be justly expected
from manufacturers.
When tires are returned for adjust
ment because Of blowouts chauffeurs
doubtless believe in the majority Of in
stances that sufficient pressure has
been maintained to justify the claim.
This, of course, is a matter of approx
imation or opinion unless a pressure
gauge Is used.
In the experience Of supply depart
ments claims are frequently made
based on the statement that the right
pressure was maintained, being sub
jected only to test of hand pressure
and looks. A test made by pressure
gauge indicates in nearly every case
that the actual pressure is little more
than so per cent Of that required.
In one instance of a 935 by 135 tire
on a limousine car weighing 5000
pounds 1t was recognized and admitted
by the owner and chauffeur that at
beast ninety pounds pressure was re
quired, and it was asserted that such
was the pressure maintained. as the
chauffeur stated he had been initiating
tires for more than ten years and be
lieved his judgment could be relied on
without the necessity for the use of q
gauge. The tires were tested in his
presence. and forty-fve pounds and
AEy pounds pressure respectively
fe indicated by the gauge. The ne
Sessity for gauges to determine the
proper imitation was Immediately and
frankly admitted
Tires are made of a number of lay
ers of canvas over a spherical mold.
the layers bound together with an
anti-frictiOn compound Therefore if
they are only partially inflated they are
t1attened out by the weight Of the car.
When small stones are struck
brief and sharp depression is made
in the tire, which causes break in the
nnermOst layer of canvas, which will
soon chafe the adjoining layer. and
each layer will then go in turn until
the tire finally blows out. If the tire
were well inflated the same stone
could not make such a depression.
These are often the causes of what
che owner or chauffeur calls a defec-
tive tire and are the occasion Of just
objection by manufacturers to a re-
placement All reputable manufacture
ers are ready and willing to replace
defective tires. and no trouble is found
in the adherence to the mileage guar
antee, but proper imitation is justly, and
for the reasons stated, desired and de-
manded