176 



LAND DRAINAGE 



on grade stake 3, while the long-rod man moves to stake 2 

 and places the long rod upon stake 2. A reading is ob- 

 tained in the same manner as before and properly recorded. 

 This reading is used to determine the height of stake 3. 



228. Recording data. The table used for recording 

 these readings will be somewhat different in form from 

 Table XII. Table XIX illustrates the form to be used. 

 In columns 3 and 4, of Table XIX, will be found the 

 readings as they would have been obtained if the hose- 

 level had been used in leveling for the drain shown in 

 Fig. 47, and if a rod with decimal scale had been used. 

 In all other respects Table XIX is like Tables XIII and 

 XVI. 



TABLE XIX 



229. Positive readings. A positive reading indicates 

 that the stake for which it was taken (the stake upon 

 which the short rod rested) is higher than the stake from 

 which it was taken (the stake upon which the long rod 

 rested), or that the stake upon which the short rod stood 



