106 THE WOODSMAN S HANDBOOK. 
Volume Table for New Hampshire Spruce. 
| 

HEIGHT OF TREE IN FEET. 
40/45 50/55 60 65 70| 75 80 85 90° 95 



high (inches, ) 
-_ 
‘ONTENTS IN BOARD FEET BY THE BLODGETT RULE. 
Diameter breust- 
10..| 42 | 49| 55| 63| 72| 79} 87) 95/104/112/-.._|_._.|___- 
11..| 49 | 59 | 67] 76| 87] 97} 105) 11E | 125/136|_...)-.-_|.-_- 



12..| 56 | 69 | 80} 90) 102/115 | 125) 137} 149/162|_ ..|.._.|.... 
13..| 64 | 78 | 90} 104/118] 132) 145 | 159/174| 188/202]... .|.__- 
14..|....| 87 | 101/116 | 132! 148 | 164 | 180} 198 | 214 | 232]. ___|._ 1 
|) ed see Sera ie 130/147 | 164 | 184 202) 222 242 262)... | 
ra eee Bes |---| 142 162 | 182 | 204 | 226 | 250 | 272 | 298 | 324]... 
1 OSs GA Te |_...|.--.|177 | 202 | 226 | 252 | 280 | 308 | 386 | 366... - 
18. .|...2|....|7...|----]..--| 219 | 249 | 280 | 312 | 345 | 379] 411]. _ 2 
| eee Fae MR Ma RE ce on Te 
546 
20-.|----|-2|..2)-22:|-2-2 |e. 22]. | S401 S80 aoe eee 

VOLUME TABLE FOR WHITE FINE, IN CUBIC FEET.@ 
The volume table for white pine, in cubic feet, which follows, is 
based on the measurement of about 100 felled trees. Instead of 
constructing the table by the method described on page 100, the 
method of form factors was used. 
A form factor is the relation between the volume of a tree and 
the volume of a geometrical solid of the same diameter and height 
asthe tree. It represents the taper of the tree. In the present 
case the solid chosen is a cylinder, and the form factor is a num- 
ber by which the volume of a cylinder, which has the same base 
and height as the tree, must be multiplied in order to obtain the 
volume of the tree. 
If a is the area of the base, or the area of the circle correspond- 
ing to the diameter, the so-called basal area; h the height of the 
tree; V’ the volume of the tree; f the form factor; then— 
V=aXhX/J; or f= Eo: 
axh 
This formula was used to calculate the form factor of each tree. 
First the cubic contents was determined, the stem alone, with the 
i 


«From The White Pine, by Pinchot and Graves, 

