246 APPENDIX 



1 . The use of the level. Setting up ; taking and re- 

 cording readings ; determining height of instrument ; deter- 

 mining difference in elevation of two points. 



2. Laying out a drain. Establishing location; driving 

 grade stakes; placing finders. 



3. Notes. Making tables ; introducing stake numbers ; 

 distances; and elevation of stake 1. 



4. Leveling. Taking back-sight and fore-sight readings, 

 and properly recording. 



5. Computations. Determining the elevations of the 

 grade stakes; making profile; establishing grade; deter- 

 mining depth of ditch at each grade stake; determining 

 the height of grade bar at each grade stake. 



6. Setting up grade bars. 



7. Digging ditch (when a practice ditch, or better 

 where a real ditch, can be had to dig). Opening ditch; 

 digging ditch ; finishing bottom. 



8. Laying tile and blinding. 



9. Filling. 



10. Construction of hose-level and rods. 



11. Use of the hose-level. Leveling with rods; level- 

 ing without rods; making computations, if opportunity 

 offers, to establish grade, and determine depth of ditch 

 and height of grade bars for a drain. 



These operations are fully explained in the text and 

 may be taken up as the text is studied or they may follow 

 later. 



