88 OVERHAUL. 



from a letter by Mr. Fisher that was published in Engineering 

 News, Feb. 7, 1901, further explaining the method.] 



Referring to Fig. 3, prolong that portion of the balancing 

 line which passes through Stas. 230 and 240 to the point P, its 

 intersection with the horizontal line through Sta. 235; the 

 lines of haul are drawn from this point to each point of flexure 

 of the dotted and solid curves. The limit of haul is fixed by 

 making the horizontal distance between the upper intersection 

 600 ft. 



The swelling or shrinking of the material is shown by the 

 relation between the extreme ordinates of the solid and dotted 

 curves, as shown in Fig. 3. The balancing line is nearly al- 

 ways more or less inclined. It is horizontal only when the 

 volumes of the adjacent cut and fill are equal to each other. 

 The point P will not usually come within the limits of the 

 drawing, and it Is only in rare instances of great expansion or 

 contraction of material that it is needed in practice. The in- 

 clination of the balancing line is generally so slight that the 

 lines of haul can be drawn parallel to it or a trifle divergent 



