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Show khheseen bum? HARD 0NS?R1NGS Much of Expense, Time and Temper Could Be Saved in Most Cases. How much blasphemy has heen roi(Yi and money spent because an unforeseen bump caused a spring to sr.ap and make it necessary for the motorist to linip to the nearest garage on the axle? Tliotgh It is impossible to answer such a question accurately, it is certain cer-tain that much of the expense, time and temper could have been saved if the car driver had been informed of spring action and prepared his car in advance for such emergencies. Ordinary usage over smooth roads never breaks springs. Spring break-nj:e break-nj:e is caused by high speed over bad paving or the hard hitting of rough spots in the roads. Spring designers hihI car builders understand this- and )try to get springs that will withstand severe shocks, yet afford sufficient flexibility for good paving. Nature of Rebound. When a spring has suddenly been compressed or fully flattened so that tin; car and axle come together, the I'liergy of the spring steel immediately exerts a pressure to return the spring to its natural shape. With the wheels ii the ground, there can obviously be no give in that direction, with the re-Milt re-Milt the car body is thrown violently upward. This action is called "rebound," and It is that rebound that causes discomfort discom-fort to tlie car passengers. Furthermore when the car frame I'ounees upward it goes beyond the "urinal stage mid tends to pull the sl'ings and axle upward, thus putting put-ting an unnatural strain on the spring. It Is this uction that is as destructive to springs as the original sudden compression. com-pression. Should such action occur to the rear nxle, the wheels then lifted off the ground by the rebound will start 'o spin, with the result that they dig the surface doubly hard when they ''it the road again. Many Types of Devices. Pur several years car manufactures manufactur-es have realized the need for a de-that de-that would control the rebound, -"'lie, even now, equip their cars with ""road levelizer" (which might better bet-ter be called a "car-action levelizer") Wore they are shipped. Practically "" nianufacturers provide boles in 'tit1 ear frames for the installation of 'N'ouml.eontrol devices. There are many types of devices on '"tirket, and they usually are ""led shock absorbers or levelizers, ','f du(J' to levelize the action "I the car. The object of a true levelizer is ' allow the springs free play who,, good roads and to control the re-. re-. '7 wl'eu bumps are hit. The lat r Is accomplished by preventing the ""'Pressed springs from expanding Quickly and by minimizing the astrous snap that, causes so much fort"S breilka8e u"d ritllug discoui- |