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Show 28.000,000 TIRES FOR AUTOMOBILES WASHINGTON, Oct. 11. "Twenty-eight "Twenty-eight million tires are now yearly necessary ne-cessary to equip the passenger automobiles auto-mobiles and motor trucks irf use in the United States. To this should be added not less than twelve million more tires, lor man vehicles accumulate accumu-late mileage to such an extent 'hat a second set of shoes is necessary, 'r,f I say nothing of the thousands of inner 1 tubes. 1 "Fort) million tires and their inner! tubes at an average cost of ?25 givesi a total tire bill of $l.uOO,000.000 l fairly tidy annual expenditure for road I .mil i :.i v. -1. ;.ii ion. Iknce it1! lis liirrn linn lo i.ay a litCo more at-1 tentitni to ih- .it.it ol 'lie various! road surfaces on the motor vehicle in-B , i. nl ol con-.iih rini; only tho damage j by the motor which- in the ioac."j .-.iv M. Lldridue. director of road? M lot the American Automobile assocla-Hon. assocla-Hon. "Vou can scarcely pick up J paper without seeing in it something I about how and wh the fnstmolns j passenger car and ihe loaded motor 11 i truck rlamae-e the inad and. a? '0U JI read un ou note hov the writer pro- j pi o ! i-n a highway to with- stand these- effects and how speed and weights should be limited, and how j the cosl burden should he distributed, j ' Few of those who discuss traos-H portation questions give thought to I the fact that our seen million motor I cars which require annually twenty- I eight million, tires, exclusive of re 1 aewals, create a problem namely, J ... - nnBH now last wilt inese tires um each : p.- ol mad surface? Compare 1 for instance ihe -niooih usilicnce of I Fifth . enue with the rou?h, gritty and flinty surfaces su ofr-ii encoun- 1 ed on country roads, and try to j Imagine what a tidy sum In tire bins j d b saved if we could .ill 'ravel 1 on avenue surfaces. The saving in tire COStS alone would pay the difference J in construction cost in many ia' m : stances. J "How much does the road surface govern the amount of gasoline re- quired bv the motor vehicle? Tlils i l (uportant and timely question, mm I right now serious minds are vorC'l ing over the futuie of power sourc for motor cars No conclusive test ha-.-e been made on all types of roaj i under absoluteh uniform condition? I and With disinterested motives. Sue 1 data as has been assembled shoM that road surfaces offer tractive sistanccs runnlns all the way from 3C I pounds or more per ton for ad "f IT loose gravel to 20 pounds and lo?? m the best grades of smooth hard a aced pavements. 1, |