The evening world. Newspaper, August 20, 1919, Page 15

\ oa o> Rubber is not always resili- ent. Any man who has ever bro stem knows and brittle can fi feet As As arahared J for ti Figed ag pcos wy apes is rvs aa “ét wears away - O%Sullivan’s Heels cAbsorb the shocks that tire you out Copyrighted, 1919 by,0'S. R. Co: ae workers seek out rubber roe a ‘nursery””, the rubber trees peasb a they are transplant. where they mature in about six years. ht of four or to permanent UST as good flour is necessary to make good bread, so only MN ipa seal, rubber will make Paploee bread depends upon ae than good flour—it depends on the dough, or the mixture of flour with other ingredients. It is the same with rubber heels. Rubber itself is an elastic, resilient substance derived from the milky juice of certain tropical trees. In its crude state it is not at all suited to practical use. Heat and light are its natural enemies. It becomes soft and tacky in hot weather and stiff and brittle in cold. Only by mixing it with other ingredients, and then “curing” or baking it under pressure can rubber be made really useful. ‘ Why “compounds” differ The mixing or “‘compounding” process is not the same, however, for all articles made of rubber. Each of the 30,000 dif- ferent rubber products in use today must have individual characteristics to meet The difference between ordinary rubber heels and O’Sullivan’s Heels If an O'Sullivan Heel is cut along the side, as shown at the right, so that a thin strip of rubber is left attached at one end, that strip will have great elasticity—it can be stretched several inches, With an ordinary rubber heel the material snaps in two before it» has stretched to any great degree. This test proves the remarkable resiliency and durability of O’Sullivan’s Heels. Rube er a your is els is mixed, and baked like bread: - The SPRINGINESS and DURABILITY of a rubber heel depend on the DouGH, or “COMPOUND” the use for which it is intended. One must be hard as in A ip taimniy and combs, another soft and spongy as in pencil erasers. One must endure steady pressure, another continuous pounding. Sell others must withstand the grind of abrasion. Eon mrt thee er te depends upon its “‘compourid’’. fecting the “compound” the Rie pram} ‘ist works backward. He first d the use to which the article will be put, anid the work if. will baive $2. d, Then he chooses from among a hundréd varieties of rubber and thousands of compounding ingredients until, by experiment, he has established the correct “compound” for the required use. Why O’Sullivan’s Heels have so much “life” O’Sullivan’s Heels~now universally rec- ognized asa practical necessityof cityliving conditior it an exacting demand upon the ‘“‘com *, O’Sullivan’s' Heels must have resiliency and durability— the springiness to endure continuous pounding, and the toughness to withttand daily grinding on hard pavements. a To secure the resiliency Heclseathestendardotreses rubber heel quality, Guaranteed to outlast any other heels O’Sullivan’s Heels-are guaranteed to wear twice as long as ordinary rubber heels; and will outlast three pairs of Go to your shoe repairer today and have O’Sullivan’s Heels put on your shoes. sure that you get O’Sullivan’s—avoid the . disappointment of substitutes.’ an*