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Show DETERMINE WEAR ON AUTOMOBILE TIRES I Following a Tire Under Various Loads. I 'Itl'h'o t'"'0llgl1 clear P,ate e'llss ; ; Mil the naked eye and the pho- 4 amwa.- tlie bureau of tolaiil exPerlmenting with a ,r y constructed apparatus to de- ''H,lri,and wh tlle treads of cr the -vi 'PS wear and tlie efTect Tl UA,e load and air pressures. :r ln,i,fI),araUls' devised to ascertain "fl"un i observatins the varying ;fiir' jnons m tire treads for tlie ;6inh , f tlle '"dustry, includes a t tl" ,Car n,IV0d back 1,nd f01'"' :repre' . by ?k and pinion, with Mm ilgainst tl,e Sass P'ate at J' text If81""88 nnd londs' The subicci f 1, WrittCn statement on App. 1 fo,ows: Mobile h bj ,Wllicl1 tl,e wear of 'd nJ s lu service can be remitted re-mitted h SUUlied llas just boen -1 m!ce ,b,';:eau of 8tnd'-" a thioL e ls wstfucted if' ""ter oi a'Ver of rul,ber aro"nd :VrinS su,'fCUmference t0 act as " ' rrod tn ace' TI'S is commonlv S"'S'ishort 16 "'e,"j of tlle ,ire ,1S -' hlc (he bod;'' of tlle ' t,ressurp1Srrf!esisned t0 withstand :&n to Ie '''''a' tread, in nd e ih 7 tractive properties tv Sho"!d wear down unifonn ly and at such a rate that it will last as long as the remainder of tlie tire. From an observation of tlie manner man-ner In which treads wear in service as well as from laboratory tests, it is apparent that the wear is influenced by the construction of the tire and the design of the tread as well as by external conditions such as road surface, sur-face, speed of operation, etc. The fact that the wear of a tire tread is influenced by the design of tlie tire has been emphasized by tlie general adoption of the balloon tire, which j because of Its large contact area sub- I jects the tread to greater distortions as it conies in contact with the road than Is usual in high-pressure tires. Tlie bureau has built an apparatus consisting of a small car, which maybe may-be moved back and forth on a track-by track-by rack and pinion. The body of the car consists of a sheet of clear plate ; glass. A tire under a definite load I and air pressure may he pressed against tin's glass plate and observed j through the glass. I'.y running the car along the track while the lire is , pressed against it the distortions of lhe tread corresponding to the action in serviie can he seen and photographed. |
