The Bridgeport evening farmer., 1913-11-21
CAUSE OF BIow-oUrs.

CAUSE OF BLOW-OUTs.
 s'No doubt every rnotorist has had the experience of the so-ca1led blow out This experience affects all in the same way. It is nothing but an ex- asperation, and although a blowout can often be repaired, the motorist cannot help preferring never to have had it in the first place" says F. A. Henderson, manager adjusting depart ment of the Goodyear Tire and Rub Der company.
 "A blowout is due to one of a, few simple causes, which if given the nec- essary attention can be easily avoided. To prevent the blowout we seek the cause and eliminate it. Accordingly we will show and explain briefly the different causes of b1ow-outs.
 ttIn former article of this series the all importance of initiating tire to the proper pressure was discussed. The amount of air in tire is just as important as the tire that contains it.
 Improper imitation renders a tire susceptible to b1ow-outs just as prop CT imitation prevents this annoyance. This is the reason:
 The body of the tire is of fabric; several piles are used and the mass after being thoroughly impregnated with rubber, is vu1canized into an in
 
 is a layer of rubber-the tread.
 What happens when a round stone, a brick, a car track, or any blunt ob- Ject is encountered? If the tire is inn properly inflated, the internal air pres sure not offering Sufficient resistance, the object will sink into the tire fore ing it inward at this one place. The tread comes into actual contact but it's elasticity allows it to adapt it's shape so that it usually suffers no in- jury, unless the object be sharp and cuts it. But the effect on the fabric is more serious. It isn't elastic; 1t can't stretchs consequently, if the ob- ject sinks in far enough to produce enough strain it must break.
 Naturally that ply of fabric receiv- ing the greatest strain is the inside one, for it undergoes the greatest dis tortion, and for this reason it is the first to break. Seldom indeed is any shock violent enough to break every ply of fabric and cause an inm ediate blowout. Most always it is only the inside ply that is fractured at the time. As this isn't apparent, the tire us- ually continues to give service, but the broken edges of the inside fabric chafe the other plies. The natural bending of the tire finally breaks the remain ing plies and then the tube forces it's way through. resulting in a blow -out.
 ''This is the first warning the motor ist receives that som ething is wrong. He didn't know the fabric was broken some time before. He sees nothing but the immediate conditions and doesn't t realize that his misfortune is some thing he could have prevented if he had only known how.
 The reason the inside ply of fabric broke in the first place, was the result of improper air pressure. This per- rnitted the object on the road surface O. one place to the breaking point. Had the pressure been of the proper mount it would not have been possible for the object to have made such an i'm pression. The resistance, and the shock instead of being localized would have been distributed all over the tire, and so a~Sorbed without injury
 Hence the remedy: Use the air gauge and carry the proper air pres sure-twenty pounds for every inch of width.
 Again the tread may receive a cut. Various foreign substances from the road surface are forced through the cut by the motion of the tire. As a result these impurities have tend ency to spread, separating the tread and fabric. This opening of the tread lays the fabric bare to road wear, and the action of sand and moisture. The latter rapidly rots the fabric, weaken ing 1t until the pressure can no long CT be sustained, and then the same aforesaid fatality occurs.
 For this the remedy is repair gum Cuts repaired in time will grow no worse, and so these consequences are avoided.
 "In conclusion, there are two inn portant causes of blow-outs-under- imitation. which results in the break ing of the piles of fabric, and neg 1ected tread cuts. Avoiding these by means of 8 pressure gauge and can of repair gum, the motorist will be able to avoid the trouble to which they lead-the blowout