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 ab c = 30°, 
setting a stake c in the range 
a x. Then a b = 2 a c. 
5. Method by Tangents. (D) With the compass at a 
set a stake at b, 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 6, take the bearing of 
c b and thus get the angle ab c. In the table of tangents 
d Q 
look up the tangent of this angle. Then ab = -— . 
F 6 5 tan a b c 
Fig. C 
Fig. E 
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 b 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- 
