366 Forestry "Quarterly. 



Obtaining the Elevations of Slope Stations with the Profiling Rule. 



1. The elevation of the base line stake is 5535 feet. The strip 

 is being run due north. From slope station No. i on the base line 

 to slope station No. 2 on the slope reading is — 20%. Taking the 

 rule and applying the graduations for the 20% slope: — place the 

 O point of the scale on the base line station. Read to slope station 

 No. 2. The drop is found to be 99 feet. Subtracting 99 feet 

 from the elevation of the base line stake gives the elevation of 

 slope station No. 2 as 5436 feet. 



2. The elevation of the base line stake is 5470 feet. The strip 

 is being run due south. From the base line stake south the first 

 slope reading is 8%. Taking the graduations for 8 per cent the 

 drop is found to be 26 feet. Subtracting 26 feet from the 

 elevation of the base line stake 5470 feet gives the elevation 

 of the slope station as 5444 feet. The slope station is on the 

 edge of a dense body of brush. 



3. The compass man has sighted upon the tip of a tree on or ad- 

 jacent to the line, on the opposite side of the body of brush or in 

 the brush as the case may be. The slope reading to the tip of the 

 tree is plus 10%, Applying the 10% graduation the drop in this 

 case will be a rise. The rule gives a 26 feet rise. Adding this ele- 

 vation to the elevation of the slope station, 5444, gives the tip 

 of the tree an elevation of 5470 feet. The compassman has ob- 

 tained the height of the tree and has entered on his map sheet 

 the height as 55 feet. Subtracting 55 feet from 5470 feet gives 

 the elevation of the Slope Station at or near the base of the 

 tree sighted upon as 5415 feet. 



4. On the strip starting from base line stake 5535, in the 

 swamp from slope station 5361 and from 5369 the compassman 

 has intersected the small knob to the right of the line. From 

 slope station 5369 the slope reading is plus 20 %. The rule gives 

 a 57 foot rise to the tip of the knob. Adding 57 feet to the ele- 

 vation of slope station 5369 gives the elevation of the knob as 

 5426 feet. 



Locating the Contours Betzveen Slope Stations on the Strip. 



I. On the strip ending with Station 5480: — 



The last slope reading is 5%. The elevation of the last slope 

 station is 5480 feet. Tqlcjnsr the rule graduation for the 5% slope 



