Show TIRE WALLS PALLS USUALLY THIN ToI I Designed Especially To Release Heat Of Friction rAn An ordinary piece of steel wire will III become hot after atter being flexed a 0 few times and In to the course of ofa ofa R a minute or t two 0 will b beak b ea The ordInAry automobile casing Is call call- callej call el ej ei upon to withstand the action of thIs heating and flexing Into the millions of times IA A cord casing for example will Hex flex times In a 0 a rile drive Each Urn time that any en ghen en spot In the casing fin flexes when It strikes the ground a little bit of heat Is generated Ins Ins-da de the tire the additional This bring about an addi addi- 1 problem for tor the technIcal man who Is charged with the re- re re responsibility ot oL giving the car own own- owner owner own cr er a a G maximum amount of mileage III each casing lIe He trust must demise dc Iso t 1 i means man of escape for this flits Inter Inter- internal Inter nal heat hlat It Is destructive to the I the because It cs es to separate till the plies piles of ot fabric Therefore the sidewall of any automobile tire Is mad vry sery thin so a as to afford a 0 means mean of ot escape for tut the heat hent Rubber Is h pretty I mach of a non non-condu non of ot heat so the side sidewall must be I Some of the heat generated ln of the casing Is absorbed by b tho ho metal 11 which Is a good heat hlat con con- con ductor conductor This principle of heat generation can an he be easily found out by any m motorist simply by feeling the tire a after driving Ing some time without a astop aStop stop The tire will III be bo warmer the atmosphere A casing In the course cours of ofa ofa ofa a norma season soon of o driving will flex lex from to 35 85 limes which means from 5 6 to miles according to tire r pen n In all of ot these millions of I the tire the must bo be prepared ared to absorb and throw of of the strain without breaking na is tl-o tl piece of Ito steel st el wire does after aler twenty or I thirty 1 |