Show How Steps Steeps s Grade of Road Can You Figure How steep Is the grade gre-do on that load Well ell I should say ay that It Is all of 30 20 or 35 per p r cent But I dl Idl t ha o ha 0 any trouble In la making IL 11 with my car Iso Io sir She Sho pull pull- pull pulled I cd ed It like Ilke a house afire Made It Iton Iton Iton on high all the th way yo Passed two cars laboring along In second How often with variations do dowe wo we hear 11 ar these words from drivers pRoud ot of the achievements of their cars frequently to the tho disparage ment ment of priced hIgher cars cau from which presumably a better Belter per per- performance should lie b expected Al- Al Alter Al Alter ter listening to statements of ot per thIS hind from hundreds hundred of ot tourists anxIous to tIll ti-ll of ot their trips tripi and the tho remarkable exploits of ot thel their cars cors one on I Is a at least convinced that not one on man In n a a hundred hiss has ha the proper estimate of o the th percentage of a grade trado encountered No reli- reli reliance rell-anc rell ance Is I to be b placed on such esti- esti estimates e tl mates expressed by any any than ono one who knows know from actual I measure measure- with nith a 0 a Approaching an on ascent the grade gre-do naturally appears appear steeper than It actually Is I Ibis coupled couple with the tho performance of ot the tho Individual cur car which mayor may or may moy not make mak the tho grade In Sigh high goal gear gives rives ricO to on an Incorrect estImate of ot the tho percent percent- percentage percentage percent us age of ot the th grade irid Many motorists ts do not under under- understand under stand the th process by which the tn des des- de of a a grade grode rade percentage Is at belle ln that a 20 cent grade trade of Instance Is I ono one which rises rise at ot an angle e of ot twenty degrees from the tho th horizontal This Is erroneous The Th designation ot of 20 per pOl cent to toa toa toa a grade grado means that In the tho grade Is Ix a perpendicular rIse or of feet teet In horizontal feet foet etIn In other words to generall the th numerical percentage of o a grade In- In In that number of ot perpendicular lar her rise In horizontal feet In relation to degrees It will bo be found J that a 0 grade properly arrived at In this wa we- forms form an angle ongle formed when the numerical expression Is taken talen to mean meon do- do degrees de grees Definitely a 30 per cent grade trado is about one half as a steep as athe the tho grade erade formed by a 30 degree anglo angle from the th horizontal The Tho steepest grade crado on which a acar acar acar car can obtain traction Is If tl 46 per percent percent percent cent cent and this thi Is a n cry ery stiff gl ade You can be reasonable certain that If ou oi have estimated eStimate a a grade grado as 30 or 36 35 per cent and your our car pulls It In high gear cear that your es- es es estimate of the road s steepness Is probably double or even evon more maIo what It actually Is I |