l8 Forest Mensuration 



for example, diameter (breast high), 20 inches; contents 600 feet board 

 measure. 



4 The contents of a tree in feet Doyle approximate, assuming that 

 the bole is cut into 16 foot logs, and that the tree tapers 2 inches per log: 



N X D (D 12) 



wherein N represents the number of logs obtainable; D the diameter of 

 the butt log without bark at breast height. 

 5. The cordwood contained in a sound bole is: 

 D* 



wherein C amounts to: 



1.5 in the case of trees 8" through; 

 2.0 in the case of trees 16" through; 

 2.5 in the case of trees 24" through. 



PARAGRAPH XXVIII. 



SCIENTIFIC METHODS OF ASCERTAINING THE CUBIC CONTENTS OF STANDING 

 TREES BY MERE MEASUREMENT. 



The cubic volume of the bole, on the basis of diameter measurement 

 and height measurement, in the case of a standing tree, may (with the 

 help of climbing iron, ladders, camera or instruments constructed for 

 the purpose) be figured out: 



1. According to the formulas of Hossfeldt, Riecke and Simony. In 

 this case, the upper diameters must be measured indirectly. 



2. According to Huber's and Smalian's formulas, the diameters of 

 equal sections of the trees being indirectly measured. 



3. According to Pressler's formula, which is, for the volume of the 

 bole lying between chest height and top bud, 2/3 of sectional area "S" 

 at chest height times "rectified" height of bole. The rectified height "r" 

 is the distance of chest height from that point of the tree bole which 

 has l /2 of the chest height diameter (from the "guide point"). The 

 equation 2/3 r x S holds good for paraboloid, cone and, at a slight mis- 

 take, for the neilloid. 



The volume of that part of the tree bole which lies below chest height 

 is ascertained (as a cylinder) as being equal to sectional area chest high 

 times 4.5. 



REMARK: 4.3' is the chest height usually recognized by the authors; 

 Pinchot adopts 4.5'. 

 The Pressler formula does not hold good for truncated boles. 



