THE PRINCIPLE OF THE KLAUSSNER HYPSOMETER 



237 



will serve to read height in feet, or in any other unit of distance, as 

 meters, since whatever unit is used 

 to measure the distance from the 

 tree applies as well to its height. 



The Klaussner Hypsometer. In 

 hypsometers based upon similar 

 triangles as show^n in Fig. 43 the 

 vertical scale represents tree height, 

 the scale at base, distance to the 

 tree. If the scale be is on a movable 

 arm, it may be set on the scale Ac 

 at any required distance. By sight- 

 ing along Ac towards C and by rais- 

 ing the sight or bar A 6 to intersect 

 the line of sight AB, the total 

 height of tree is read directly from 

 the scale be. The standard hyp- 

 someter of this make is known as 

 the Klaussner, Fig. 44. The verti- 

 cal scale is weighted to insure its 

 vertical position. 



As is seen, two lines of sight 

 must be adjusted for this reading. The instrument is therefore used 

 with a tripod and is rather slow in execution.^ 



Fig. 44. — ^The Klaussner hypsometer. 



^^--:b^ 





Fig. 44a. — Method of application of the Klaussner hypsometer. 



1 In Forestry Quarterly, Vol. XIII, 1915, p. 442, S. B. Detwiler has suggested a 

 simple hypsometer based upon this principle, which for practical work does away 

 with the tripod apparently without sacrificing accuracy. 



