Norwich Bulletin Newspaper, December 10, 1919, Page 12

* Many peotle believe that rubber heels are made by ; ouring liguid gubber into moulds. This is not the case. The heels are stampe.! out of rubber dough or ‘‘com- pound”’ in the exact size fo fit the moulds. Then they are put nto the moulds and baked under pressure. Native workers setting out rubber tree seeds in a pladtation “‘nyrsery’. When the rubber trees reach a height of four or Sive fect they are transplanted to permanent fields where they matur: iz about siz years. UST as good flour is necessary J to make good bread, so only good quality rubber will make gocd 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. 1t 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 mixzing 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 Many methods of tapping rubber trees are employed by different growers. Probably the most scientific is the her- ringhone method used by this native girl t0¢ ttogilky juice from the tree. On plantations the milky juice of the rube ber tree is coagulated, or congealed, in large vats by means of o weak acid. - This process of removing the water has largely superseded the more primitive method of smoking the fluid After rubber is skim- med from the congeal- ing vats it is dried thoroughly before be- ing baled or boxed for shipment. Plantation rubber reaches .the . rubbeft. manufacturer practically pure. “The sPRINGINESS and DURABILITY of a rubber heel depend on the pouGH, or “COMPOUND” theuse 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 as a 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 withstaad 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 proce ess, with the best toughening agents known. The “compound” is next rolled into long strips and the heels stamped out Jjust as biscuits are cut. Then the heels are placed in moulds and baked in vulcan- izing presses the exact length of time to effect the “cure”., It is this special process of mixing and baking that has, sin¢e the making of the first rubber heel, established O’Sullivan’s Heelsasthestandard of rubberheel 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’sHeelsare 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. over fires made of palm nuss. Rubber is not glways resili- ent. Any man who has ever broken a pipe stem knows just how hard and brittle wubber can be. ’ St 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 resiiiency and durability of O’Sullivan’s Heels, O’Sullivan’s Heels eAbsorb the shocks that tire you out . As prepared for the pencil eraser, rubber is soft and crumbly. " Its resiliency is slight and it wears away rapidly. = Copyrighted, 1919 by 'S, R. Ca. ubber for your heels is mixed and baked like bread e e ——r—