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Show Likening of Auto Tire to Human Body Helps : The likening or a pneumatic tire to 1 a human body is one of the favorite topics found in manuals circulated by tire manufacturers for the purpose 'of helping the motorist secure all the mileage that -has been built into the tire. I The carcass of the tire corresponds to the bones and muscles of our bodies. The outer rubber covering (tread and side cushions) protect the tire as the skin protects our bndi,-s. Cuts in this rubber must he repaired to prevent infection. Inflated pressure pres-sure to a tire is what food is to embodies. em-bodies. There is another similarity, however, how-ever, that has not been described the tire's need of exercise. It is a fact, that a spare tire resists natural ageing much bt'ter if It is put into service fnr a day every month. The reason for this is obscure, but is probably prob-ably due to what physicists call "molecular "mole-cular rearrangi-ment" in the rubber portions of the tire caused by ffexins. Whatever the cause of the deterioration, deteriora-tion, it is a fact that n spare carried month after month without being "ra-j "ra-j erciscd" occasionally does n' ret. in j Its wearing qualities as weM as one i that gets an occasional day's use. |