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Show HSHIiP FOR SIXTY YEARS Such Is Declaration of Men Performing Test on Dodge Cars. There is little left to chance In the making of motor cars these days. Every part and -every bit of material that goes into the well-made cars is so thoroughly-tested thoroughly-tested before use that their future can b" written out in advance. To accomplish these tests, however, manv wonderful machines have been developed. de-veloped. One of the mnst interest in? in the laboratory of Dodse Brothers is a device de-vice which for twenty-four hours eah dav tests sprinps. The principle is ex-ti-emelv simple, although In practice, to asrertain results, it is complicated in its workings. The center of the spring is held sta-lionarv sta-lionarv while rapidly moving arms vibrate vi-brate "the r-nrls, exerting the same force that the sprinc would be r;i llfd on to c-nmbat on an exceedingly rouuh road. It tests not only for rTm'.h. elasticity and other fjualities. but also mrkcs vermin ver-min that ih measurements fire absolutely abso-lutely correct. The overload pressure is applied at the extreme rate of 15." vibrations vibra-tions a minute, until the spring has absorbed ab-sorbed more shocks 1;;an it would be called upon o survive in loner years of actual service. With a conservative number of miles per year as a basis It has been shown that some of the springs sub jected to this test would last the average automobile driver sixty years. Grease is placed between t he sprlnK leaves and tested to determine its value as a "squeak" reducer. I.iule thermometers thermom-eters are placed in small cups of mercury mer-cury fastened to the individual leaves of the vibrating sprinsr. The temperature of the leaf is, of course, a means of determining de-termining the value of the lubricant, for wherever there Is friction there is heat and a measure of heat is a measure of tlia friction. The first thinp to be done is to writo a Tribune "Wnnt Ad, telling just what you want and your qualifications; The Wants will do tbo rest. |