A New Topography Method. 



213 



This circuit was one around three sides of a rectangle, there 

 being two starting points with predetermined elevations- The 

 circuit was run in one direction to a point and left. Then it 

 was run from the other end back to the finish of the previous 

 days work. The elevations of the point were 2771 and 2769 

 .showing an error of but 2 feet over a distance of 5.12 miles 

 and a total difference of elevation of 441 1 feet. Such work needs 

 no comment. 



With the demand for accurate estimates of standing timber and 

 dejpendable topographical maps from which to plan logging 

 operations, work of this character will be of more frequent occur- 

 rence in the future than has been the case in the past. The 

 methods suggested herein may be of use to those having this work 

 in charge. 



Any additional work of road traversing, laying out of base 

 lines and such other work as was necessary, was done by a special 

 crew, only the topography away from roads, and base lines, being 

 taken by the estimating crew. 



