EARTHWORK 



in this case be taken less than the distance ca' computed by 

 formula 3. As in the preceding case, if the measured dis- 

 tance from c r to the trial point is less than the computed dis- 

 tance, the point should be moved out; if greater, it should be 

 moved in. 



Form of Notes in Cross-Section Work. When each slope 

 stake has been set as just explained, its distance from the center 

 line and the elevation of the stake above or below subgrade 

 are entered in the field book in the form of a fraction. The 

 numerator of this fraction is the distance of the stake above 

 or below subgrade, and the denominator is the distance of the 

 stake from the center line. Thus, if the slope stakes in the 

 preceding example are set at Sta. 131, the complete entry in 

 the notebook will be as follows: 



C*l 1 4 



The fraction indicates that the left slope stake at m, 



Fig. 4, is 27.2 ft. from the center line of the roadbed and 11.4 



C2.3 



ft. above subgrade. Similarly, the fraction - indicates 



13.5 



that the right slope stake m' is 13.5 ft. to the right of the 

 center line and 2.3 ft. above subgrade. These expressions 

 are called slope-stake fractions. 



When the ground between the slope stakes and the center 

 stake is irregular, the elevations and distances from the center 

 of the intermediate points where the ground changes abruptly 

 are determined and also entered in the notebook in the form 

 of fractions. 



