Show leaky auto tubes ruin millions of good tires i 9 now how does the average motorist buy an auto tube as a merely necessary and incidental accessory or as ii a part of the tire as vital as the casing upon the motorists answer to this question depends in large part the degree of ills his freedom from tire troubles the car owner courts trouble when he buys tubes carelessly the tact fact that tire costs are largely dependent upon tubes la Is frequently overlooked leaky tubes ruin millions of tires annually through under inflation ordinarily the casings are blamed for troubles for which tubes are almost entirely responsible on the other hand good tubes enable a tire to deliver the maximum mileage which the malter maker built into it it the best casing Is at the mercy of a poor tube As the tube represents a small sum in comparison to the cost ot of any standard casing it Is frequently the part of economy to throw away inferior or worn out tubes the alie purpose of the tube Is to hold bold air and to keep on holding air when it falls in this it Is worthless today all standard tubes are built of laminated construction in other words they are built layer on layer up to the proper ply this construction Is made necessary by the fact that rubber in its natural state Is a wretched air container both chemically and physically it leaks air by using a number of layers of rubber no tiny flaws can go through |