The evening world. Newspaper, May 21, 1919, Page 13

js “ai, 1919. TH EVENING WORLD, WEDNESDAY, MAY On plantations the milky juice of the rab- Native workers setting out rubber tree seeds in a plantation “‘nursery’’, When the rubber trees reach a height of four or five feet they are transplanted to permanent Sields where they mature in about six years, med from the pred Lene, fy és dried ti before pian or boxed for rubber reaches the rubber practically pure, Many methods of tapping rubber trees are ‘evhtps aed by different growers. Probably the most scientific is the her- ringbone method used by this native girl to extract the milky juice from the tree. = Rubber foryourheels is mixed and baked like bread | i The sPRINGINESS and DURABILITY of a rubber heel - se ff aS Many people believe that rubber heels are made Gi pouring liquid rubber into m This is not the case. The heels are stamped out dough or “‘com- found" in the exact size to fit the moulds. Then they are put into the moulds and baked under bressure. Rubber is not always resili- ent. Any man who has ever broken a fits stem knows just how hard and brittle eubber can be. As prepaved for the pencil eraser, ri.bber is soft and crumbly. Its resiliency is slight an’ it wears away rapidly, O’Sullivan’s Heels cAbsorb the shocks that tire you out Copyrighted, 1919 by O'S. R. Co} aE AR Vc op ay ” UST as good flour is necessary to make good bread, so only good quality rubber will make good heels. But good bread depends upon more 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 resilicacy and durability of O’Sullivan’s Heels, 6, ie eaten lta oy vd bulge ire aon atta ot, RCS ARs PRL 4 se MAR aby aaah lad Webi Sie EN Ge oy depend on the nouGu, or “COMPOUND” the use for which it is intended. One must be hard as in pipe-stems and combs, another soft and spongy as in pencil erasers. One must endure steady pressure, another continuous pounding. Still others must withstand the grind of abrasion. The final character of any rubber article “depends upon its “compound”. In per- fecting the “compound” the rubber chem- ist works backward. He first determines the use to which the article will be put, and the work it will have to do. Then he chooses from among a hundred 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 conditions—put an exacting demand upon the ‘‘compound”. O’Sullivan’s Heels must have both resiliency and durability— the springiness to endure continuous pounding, and the toughness to withstand daily grinding on hard pavements. To secure the resiliency and durability of O’Sullivan’s Heels the highest grades of rubber are combined, by a special proc- ess, with the best toughening agents known. The “compound” is next rolled into long strips and the heels stamped out just as biscuits are cut. Then the heels are placed in moulds and baked in vulcan- izing presses the exact length of time to effeet the ‘“‘cure”’. It is this special process of mixing and baking that has, since the making of the first rubber heel, established O’Sullivan’s Heclsasthestandard of 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 leather heels, Go to your shoe repairer today and have O’Sullivan’s Heels put on your shoes. O’Sullivan’s Heels are furnished in black, white or tan; for men, women and chil- dren. Specify O’Sullivan’s Heels, and be sure that you get O’Sullivan’s—avoid the disappointment of substitutes.