The Detroit times., 1913-07-07
Will
MARKET new
ELECTRIC TIRE
"POwer-Saver Pneumatic" is To
BE COmpany's Contribution
to Industry for 1914
EXPERT TALKS OF
MERITS OF PRODUCT
Resiliency and Durability Are
Important Features, Says
Manager l.. {. ROckhil

"A new electric tire called the
Goodyear Power Saver Pneumatic
| Tire, Is TO be Goodyear's contribution
TO the electric vehicle industry for
1914, announces l.. {. Rockhill man
ager OF the automobile tire depart
ment OF the Goodyear Tire 4 Rubber
Co.. Akron, Ohio, who has just return
ed TO Akron after an extensive tour
OF the Pacific Coast, investigating au-
tomobile conditions.
This tire will be supplied to our
branches in about two weeks so that
they VIII be enabled to serve electric
! car owners promptly.
In perfecting an ideal tire for cleo
tries, two fundamental qualities must
De incorporated In order TO make a
desirable tire. These properties are
reslliency and durability. The tire
must not be made SO resilient for the
purpose OF saving power. that it will
not wear for reasonable mileage.
ana on the other hand, durability can
not be accomplished al too great an
expense OF resiliency.
There are very &c people who
dlnerentiate between tires for gaso-
lihe cars and the specially built tires
Tor electrics The electric tire is
hlgbly resilient, and consequently SUI
persuasive TO the evils Of under
imitation and overlooking.
however, any automobile engineer
KNOWS that gas car tire absorbs
more energy than an electric tire. The
gas tlres ordinary plain weave fabric,
III Which the warp and filing have the
same strength. laid on the bias gives
me maximum strength and durability.
four. tye. or six plies of this fabric
lmpiegnated With gum and vuvanized
together as unit. form body of
considerable Rightly. This Rightly
NheE performing its duties as a tire.
utiilzes considerable energy to produce
the licking OF the walls OF the tire.
III me case OF the gas tire, the recoil
Is taken care OF almost entirely by the
air pressure, because the fabric walls
are quite sluggish In this respect.
Now. In order to produce a more
efficient tire, that is tire that will
consume less power, change in the
structure OF the fabric was tested,
wnen Cur engineers began their ex.
perimental work to perfect an cleo
trio tire. One OF the most efficient
tires on the market is made OF fabric
which consists simply OF warp threads
or small cords. all parallel 10 each
o'ret, and surrounded and separated
by thin envelope OF rubber The sey-
eTal plies OF his fabric are placed az
- degrees with each other. Thus hv
having each individual end of each ply
or fabric entirely surrounded BY rub
toll
the casing walls will feX with the
minimum OF resistance. The differ
en"e in the rigidity in the walls of y
gas and electric tire may be readily
noticed by depressing the debated
tires with the thumb
Now II Is very true that for some
lllne past, rather serious complaints
nave Uttered In along with the boosts
about the limited life CT the tires. I
nave explained that we had TO build
IRE which structurally was less firm
and substantial in order 10 make II
consume the minimum amount of now.
er. We put little better gum into
this tire, and absolutely the best cot.
ton we could buy. and found that we
get just as long life from these tires
as from equivalent gas tires during our
tests. When the public could nor get
the mileage. we were puzzled. and il
took us some time 10 find that @, ar.
loading or under-infation was the cruz
or the whole situation. The eyplana
/ ton is that the walls Of the fabr
Hex so readily that with under-infla
/ ton or overlooking (Which amounts
TO the same thing the fabric is
stressed excessively, resulting in pre-
mature failure. We feel certain that
SOME very good types of tires have
! been forced off the market because OF
the practice of UNDERLYING the cars.
True, an electric is slower and easier
than gas car on tires. but-an cleo
tric tire is more sensitive to neglect
than a gas tire.