LEVELING 



rodman then goes to E, a point 

 where a foresight reading is 1.35, 

 which, subtracted from 38.78, the 

 H. I. at D, gives 37.43 ft., the ele- 

 vation of E. The level is then set 

 up at F. being careful that line of 

 sight shall clear the hill at L. The 

 backsight, 6.15 ft., added to 37.43 

 ft., the elevation of E, gives 43.58 

 ft., the H. I. at F. The rod held at 

 G gives a foresight of 10.90 ft., which, 

 subtracted from 43.58 ft., the H. I. 

 at F, gives 32.68 ft., the elevation 

 at G. Again moving the level to H, 

 the backsight to G of 4.39 ft. added 

 to 32.68 ft., the elevation of G, gives 

 37.07 ft., the H. I. at H. Holding 

 the rod at K, a foresight of 5.94, 

 subtracted from 37.07, gives 31.13, 

 the elevation of the point K. The 

 elevation of the starting point A is 

 20.00 ft., the elevation of the point 

 K is found by direct leveling to be 

 31.13 ft., and the difference in the 

 elevations of A and K is 31.13 

 -20.00= 11.13 ft.; that is, the point 

 Kis 11. 13 ft. higher 

 than the point A. 



At each setting of 

 the level, foresight 

 readings can be 

 taken on a number 

 of points, before 

 taking a foresight 

 on a turning point, 

 preparatory to 

 moving the level to 

 a new position. The 

 elevation of any 



