As an adjunct to surveying, dependent on the desired degree 

 of accuracy, and the desired results called for, instrumental 

 traverses are made of the principal waters and roads on the 

 tract. The transit, with stadia attachment, is the instrument 

 most generally employed on this part of the work. The cost 

 approximates $6 per mile. 



The After the necessary surveys are made, and in actual work, 

 exploration while they are in progress, exploring parties gridiron the tract 

 at stated intervals, usually from one-sixteenth to one-half mile 

 apart. These parties keep exact records of all the natural and 

 artificial features they meet with roads, streams, heights 

 of land, growth, conditions of growth, burns, bogs, etc. These 

 are all located on their lines of travel. 



If a topographical plan of the tract is desired, and such a 

 plan is usually to be recommended except in very flat country, 



aneroid barometers 

 are carried by these 

 explorers, and read 

 at numerous inter- 

 vals. From this baro- 

 metric work eleva- 

 tions of various points 

 are obtained, and a 

 rough contour system 

 can be drawn. 



As the exploration 

 party travels it also 

 takes a record of the 

 diameters and kinds 

 of trees, by measur- 

 ing with calipers those 

 on specified areas. 

 For instance, a strip 

 66 feet wide is meas- 

 ured right along the 

 line of progress; or 

 measured acres, half- 

 acres, or quarter-acres 

 are taken at regular 



Spotted line in a Canadian forest. Note the intervals along the 



heavy, well-defined spots. party route. Where 



