138 Forestry Quarterly. 



To adjust the azimuth circle: 



1. Determine the azimuth of a line between some point that 

 can be seen from the look-out station and the range finder. 



2. Sight on this' point with the alidade. 



3. Turn the azimuth circle until the reverse bearing of the point 

 coincides with the knife-edge on the alidade. 



4. Secure the position of the azimuth disk by screwing down 

 the corner clamps. 



Last summer, I constructed three range-finders on the plan of 

 the one described, and so far they have proved very satisfactory. 



