The Abney Hand Level. 



361 



vations of the base line stake (if attainable) on his map sheet. 

 Thus his line begins with a precise elevation and closes in on a 

 precise elevation. 



Figure Four 



The. F/naf Mop F/je F/e/c/ Mop 



3co/e /6'//V//e "^ 



For/ri'Lint F/e/c/3Ae^/i 



s^so Baseline s* ro 

 -^ : ©- 



S.M 3oA^Li'na ffl/W 



iS3S . SSfa 



A sample map is shown in Figure 4 to illustrate the field work 

 of the compassman using the Abney hand level. Such field notes 

 will furnish the officeman with a greater wealth of detail than 

 is furnished by a set of aneroid elevations taken along the strip. 

 Furthermore, this detail is all of practical value to the logger, 

 trail builder, herder and all practical woodsmen. 



The final map will express the true character of all the running 

 streams. The gradient of mountain streams does not vary uni- 

 formly. There are frequent narrow inaccessible gorges where 



