OVERHAUL. 



81 



A, B, C' and A', B, C are the quantity curves for this cutting plotted 

 from the grade points in opposite directions. They intersect at B, at Sta. 

 500, which is therefore the center of gravity of the cutting. A, B, G, F is 

 the quantity curve for the fill. It is plotted one way only, because this 

 fill can be made by hauling one way only, on account of the bridge open- 

 ing. Supposing that earth is paid for at 16 cts. per cu. yd. up to 500 ft. 

 of haul with an addition of 1 ct. per cu. yd. for each additional 100 ft. 



4000 



5000 



2000 



1000 



490 

 Diagram 



500 



for Calculating 

 FIG. 1. 



510 

 Overhaul. 



of haul: First find, with a scale or pair of compasses, the two points; 

 one on the curve A B C', and the other on A E G F, which are exactly 500 

 ft. apart on a horizontal line, and draw a line between them, the line 

 D E. The points D and E represent the stations between which 

 the extreme haul reaches 500 ft., and the ordinate at D (or at 

 B which is the same in length) represents the number of cubic 

 yards cut between the grade point A and the point D, all of which 



