El Paso herald. (El Paso, Tex.) 1901-1931, 1913-12-27
PNEUMATIC automobile

( PNEUMATIC automobile tire is
/ n an envelope for the air pressure
! L A it retains The casing provides
the tensile strength necessary to sus-
tain the internal pressure and to resist
! road wear the function of the inner
tube IS to provide an air tight lining
/ for the casing. The casing is the more
expensive but this does not prevent
/ the by no means incOnsiderable saw
ing that few simple precautions with
/ the tube will return.
1t ought to be borne in mind that
I the tube is the most delicate part of
/ the tire and that to yield the highest
| efficiency it ought to be treated to
correspond. The tube in itself has
I comparatively no tensile strength; 1t
simply flattenS itself out against the
inside of the casing. If ever the casing
becomes too weak at any point, the
restrain the pressure of the inside air
cushion.
To insure good tire service, the mo-
torist takes precautions against tire
trouble. The first problem is to take
care of the casing that it will success
fully protect the inner tube. The mo-
torist also will be interested in know
ing the things to do to avoid unneces-
sary trouble with his tubes.
Proper Selection of Tubes.
One of the fundamentals is proper
selection. 1t is matter of no little
consequence to select from the many
styles now on the market, each having
apparent advantages to recommend 1t,
the type which best satisfies the essen
tial requirements for reliable service.
AS the function of a tube is that Of an
air tight lining for the casing the most
satisfactory tube is one that not only
fulfills this requirement best but
which retains its alright property
longest To remain alright the tube
must be elastic, as in service it is sub
ject to continual fleXing.
In general, there are two classes Of
frTh aG IN q ma ri OF ire
compounded. The compounded tube is
usually thicker than the pure gum
type and increased thickness is desir-
able because it decreases the SuSccptl-
bility to pinching and puncturing. Pure
gum tubes are usually not built as
thick because of the extra and essen
tally unnecessary expense this would
involve. But the extra thickness or
the compounded tube introduces more
disadvantages than this one advantage
can compensate for.
Retaining the Air.
Originally a compounded tube is air
tight and highly elastic. But it can't
retain these qualities long. The inor-
ganic compounds it contains not only
are good conductors of heat so in
creasing the tendency to heat, but are
themselves capable of deteriOrating
the rubber, especially when heated. In
service there is a natural tendency to
heat and the pure gum tube resists
this tendency, being harder TO heat,
and, in addition, is not so easily injured
by heat This is a very important IN
its effect on repairs. 1t is difficult
to repair a compounded tube satisfac-
tOrily. It's adhesion to pure gum vul-
'caniZed repairs is not perfect, and the
heat necessary to cure the repair, SerI-
Ously Injuries the part of the tube az
Eected. For a short time a compounded
tube may give good service, but the
pure gum tube is the only type capable
of all-arOund consistent service.
First of all, the immediate condi-
tiOns should be considered. The inside
of the casing should be clean. II any
dirt is present il chafes the tube,
weakening it sometimes to the yield
ing point Suppose, as often happens,
a nail or stone finds its way inside
the casing. When the tube IS inflated
it is fattened against the inside OF the
casing by the pressure and il is forced
with equal pressure against these for
eign substances Frequently they cut
the tube before it is fully inflated. And
so, the first requisite Is that the INSIDE
of the casing be kept clean.
Keep Rim Clean.
Besides the inside of the casing, the
tube also comes into contact with the
rim between the beads of the casing
The rim accordingly. also should be
clean and smooth. The chief damage
from rims, however, arises from their
tendency to rust. Rust, aside from
making the rim rough eats into the (
tube PERHAPS the most effective way
to deal with this is to paint the rim
with graphite paint WheneXer pos
sible this should be done FLAPS 70
be placed between the rim and tube &
offer protection from the rim and rust
and are of advantage provided the
user is careful not 70 pinch his tube
between the edges of the flap and the
bead of the casing, n condition us
cussed little further on.
For the repair of punctures and blow ,
outs. it is necessary frequently 10 re
move the tube from the casing. For
this reason the tube should never be
De1-u1irfed to stick to the casing, some