16 A MANUAL FOR NORTHERN WOODSMEN 



as x. Set up at b and, turning off a right angle, set a 



stake c in the range a x. Then a b = b c. 



3. Method by 26 34' Angle. (B) Proceed as before, 



making the angle b a c = 26 34' ; then a b = 2 b c, as 



may be found in the table of tangents. 



4. Method by 30 Angle. (C) 

 With compass at a set a stake 

 in line at b, and, turning off an 

 angle of 60, set another stake 

 on that range, as x. Set up 

 at b and turn off a b c = 30, 

 setting a stake c in the range 

 a x. Then a b = 2 a c. 

 6. Method by Tangents. (D) With the compass at a 



set a stake at 6, also run out a perpendicular line and set 



a stake at c visible from b at any convenient distance. 



Measure a c. With the compass at b, take the bearing of 



c b and thus get the angle a b c. In the table of tangents 



look up the tangent of this angle. Then a b = . 



FIG. D 



6. Method by Oblique Triangle. (E) The stake c may 

 be set at any convenient point visible from both a and b 

 and the angles at a and b measured. Measure also the side 

 a c or b c, whichever is easier. Then a 6 may be computed 

 as the side of an oblique triangle. For formulas neces- 

 sary, see pages 212-213. 



7. Method by Traverse. (F) In the case of a large lake 

 or stream, several courses may be run along its banks, and 

 when the range of the line is again struck, as at e, the dis- 



