Salt Lake Tribune | 1912-12-08 | Page 38 | Auto Tires Are Now Scientifically Built

AUTO TIRES HUE NOW SCIEWTIFICflLLY BUILT Scientific exactness has come to govern gov-ern tho construction of tho staudard makes of high quality pneumatic tires for tho automobile. Satisfactory, luxurious lux-urious service is tho gcnor.il result, where motorists understand that tires, liko men aud. machiucs, nro entitled to fair treatment. "Tho fact, still romaius," assorts P. AT. Litchfield, factory manager for the Goodyear Tiro & Jlubbcr compnny. "that to obtain the utmost mileage or even reasonable mileage, motorists must be fair to their tires. Highly specialized special-ized work, tests aud experienco have gone into tho evolution of tbo high grade pneumatic tiro casing. "Many substitutes for compressed air for .filling the inferiors of pneumatic pneu-matic tirc3 havo rcceutly been put ou tho market. "The greater part of these arc injurious in-jurious to the casing aud shorten its life, for the following reasons: "A pneumatic tiro' casing is designed only for use with compressed air, the air actiug as a cushion, and the eusiug acting purely as au envelope for its durability du-rability upon tho air pressure being maintained. During tbo netiou of the tire in rolling over the roads under load it stretches to sonic extent, making tbo interior volume larger, but tho compressed com-pressed air, being perfectly clastic, also expands, aud tlio casing' is still supported sup-ported by tho pressure of the air. "With substitutes, conditions and results arc different. X solid substitute substi-tute for instance, mav bo pumped in under pressure and apparently give good terico to start with, but it slows up the action of the tiro and it takes more power to drive the tire. Also, owing ow-ing to the fact that it is not as perfectly perfect-ly elastic as compressed air it tends lo make tho tire heat up. causing disintegration disinteg-ration nnd also causing the tread To wear off faster. Furthermore, us the tire stretches in u?e the solid filler docs not stretch with it, so that tho casing, not being held up properly by pressure?, soon goes to pieces."