The RURAL NEW-YORKER 
99i 
J UST how important is the layer-upo?i-layer 
construction which Goodyear employs in 
the manufacture of tubes? 
Does it make them stronger—longer-lived 
—better containers of air? 
Well, for nine years we have been building 
balloons and dirigibles, in the construction 
of which our first and most complex prob¬ 
lem was that of inflation. For gas is vola¬ 
tile, much more elusive than air, harder to 
capture and hold. 
It was finally demonstrated, however, that 
rubberized fabrics, built up layer-upon-layer , 
formed the most practical container for 
this gas. 
Once this fact was established, it seemed 
quite logical that the same principle should 
prove even more successful when applied to 
tubes. For a tube’s sole function is to hold air. 
We thus evolved the Goodyear Heavy Tourist 
Tube, making it of pure gum strips, building 
them up, layer-upo?i-layer, then curing them 
together, after which the valve-patch was 
vulcanized in. 
The soundness of this method was imme¬ 
diately established. 
The thin layers of rubber cured one upon 
the other enabled the elimination of all 
defects, such as sand holes and porousness. 
This construction also gave the body of the 
tube a criss-cross grain which prevented 
splitting if punctured. Finally, by vulcan¬ 
izing the valve-patch securely into the tube 
we prevented all leaks at this source. 
There is an observable tendency among mo¬ 
torists everywhere to use Goodyear Heavy 
Tourist Tubes exclusively. 
They have learned that the slightly added 
cost of these thick, grey tubes is more than 
justified by their longer life and by the pro¬ 
tection which they undeniably give to casings. 
More Goodyear Tubes are used than any 
other kind. 
