The physical properties and tests of lubricating oils . mplete oilfilm form bet^veen the friction surfaces, PHYSIC.^ PROPERTIES AIL TESTS 01 LUBRICATIIG OIL the Tiscosioi ana oiliness of tjie luoricant areof great iraportance. These properties, thoughQistinct, are in some way, for it be found, ~ith oils oi the saine clese,that the friction reducing power at low speedsis in the same order as the viscosity. Every-thing depends, however, upon ti-ie speed load,for froir. the moment the commence tomove relatively to each other, the oil tends tobe forc
The physical properties and tests of lubricating oils . mplete oilfilm form bet^veen the friction surfaces, PHYSIC.^ PROPERTIES AIL TESTS 01 LUBRICATIIG OIL the Tiscosioi ana oiliness of tjie luoricant areof great iraportance. These properties, thoughQistinct, are in some way, for it be found, ~ith oils oi the saine clese,that the friction reducing power at low speedsis in the same order as the viscosity. Every-thing depends, however, upon ti-ie speed load,for froir. the moment the commence tomove relatively to each other, the oil tends tobe forced between them. Therefore, the speedincreases s-no. the filra oecomes thicker , so the reduction of friction Decomesmore and more dependent upon the viscosity upon the oiliress or the body of the Determinations of viscosity, made bymeasuring the resistance offered to the motionof discs or cylinders immersed in liquids, a^re,for the most part, unsatisfactory. In suchcases, turbulent motion is locally, if not. VisGosirieter 30 PHYSICAL PROPERTIES AirXi TESTS OF LUBKICATIIG OIL generally, set up, the results this rea-son, such methods of measuring, or to the viscosity, was not T) best v;ay to measure viscosity, and the onewhich is universally usea, is to note the time ittakes lor a quantity of the oil to flov: from anozsle of given diameter, under a set pressure andtemperature. Yith rise of tem^Derature ,? the viscosityof liquids decre-sses, sometimes very rsTjidly, un-til a certain temperature is reached, where ex-cess heat v/ill not lower the viscosity. Thecurves on the tests of viscosities of the bear out this statement. There are discussions concerningviscositi an index to lubrication. Thurstons^ th8,t a liquid, to act as a ,must possess enough body or combined capillari-ty and viscosity to i:eep the surfaces betweenwhich it is interpose
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