Show Grades Measured by Per Cent Not Degrees Many are of the opinion that grades are aro measured in degrees This is is not the tho case ease for the they are measured in in per C cent That is is the per cent tent grade grado is the rise 7 per pcr unit of length the latter measured on ona 7 a line hue which is horizontal with ref reference reference- rence to 7 the slope For Tor example in the illustration 7 i ithe the slanting lg represent grades and let letus 7 us pr presume ume that the line AD AB is i. 1000 ft I Sing ng If It the point D on the vertical line BC is ft above B it would be spoken 7 I of as a 50 r r cent grade because the distance dis die 7 1 lance tance BD DD is is just one one half half that of the line 7 AB AD A 33 per cent grade would b be one I in io which there was a rise rie nse of 1 ft for lor every enry 3 measured hori horizontally on the tho AB 7 A per grade grado is on one on in 10 which the th therise rise rise or distance BC is is equal to AB All but the J f 5 angle angie in in this ease use is 45 deg and not cot 90 deg f- f s q III V OO cr I fOP ire r Kt tm I. P ctt t I in It tU 1 |