APPENDIX C 

 TABLES USED IN FOREST MENSURATION 



TABLE LXXVII 



Cubic Contents of Cylinders and Multiple Table of 

 Basal Area 



This table serves a double purpose. It shows, in the first place, 

 the contents of cylinders of different diameters and lengths. It may be 

 used to determine the contents of logs whose diameters are measured 

 at the middle. The table shows also the sums of the basal areas of 

 different numbers of trees. Thus the total basal area of fifty-one 

 trees 9 inches in diameter is 22.53 square feet. This table will be found 

 very useful in computing the total basal area of different diameter 

 classes in forest surveys. 



The values given in this table are practically identical with those 

 of the Humphrey Caliper Cordwood Rule (§ 121) for which it may be 

 substituted. By multiplying the values in the table by 1.28 the 

 contents of logs will be found in terms of stacked cubic feet of cord- 

 wood, p. 480. 



TABLE LXXX 



The International Log Rule for Saws Cutting a \ inch 



Kerf 



This log rule is derived from the values of the International log 

 rule for saws cutting, a |-inch kerf, by applying the factor .904762 to 

 the values in the former rule, computing to the third decimal place, 

 and then rounding off the resultant values to the nearest 5 board feet. 

 The values were computed and checked by Judson F. Clark in 1917, 

 p. 493. 



TABLE LXXXI 1 



Values in square feet for .16 and for .66 of the area of circles of dif- 

 ferent diameters, for computing the cubic volume of trees by the Schiffel 

 formula, F=(.16 £+.666) h, p. 494. 



1 Computed by the U. S. Forest Service. 

 479 



