78 THE WOODSMAN’S HANDBOOK. 
The method of computing the contents of a model acre or of any 
sample acre depends upon whether or not height measurements 
have been taken. Ii heights have been disregarded, the compu- | 
tation may be made in the following way: 
Make four columns of figures as shown in the accompanying form. — 
In the first column place the diameters, in the second column the 
number of trees of each diameter, in the third column the average 
contents of trees of different diameters, and in the fourth column 
the total contents of all trees of each diameter, which is found by 
multiplying together the values in the second and third columns. 
The figures in the fourth column are then added together for the 
: total contents of the acre. 
Under ordinary circumstances a crew of 4 men should be able’ | 
to measure off 30 to 50 acres a day if only the merchantable timber | 
a 
i is included. In very open woods this number may be increased. | 
hi Where small trees are measured and special care is taken in laying | 
. off the strips, 20 acres a day, or 24 miles of line, is about all that a 
| cruiser can measure. 
i Form for computing the contents of sample plots. 
HEMLOCK. | 
| 
Hs Contents of | 
" Diameter | Number of | average tree | Total con- | 
breast-high. trees. from vol- tents. | 
| ume table. 
! —__—_—___ $$ | —_____ 
it i 
1 Inches. Board feet. | Board feet. 
i 10 10 45 450° bo ne | 
i! 11 11 65 715 
1) 12 9 90 810 | 
it 13 8 118 | 944 
| 14 8 143° (tes | 
it i: 15 9 P| 1,575 | 
1 16 7 205. |= 1,435 
i | 17 6 240 | 1, 440 
i 18 6 275 | 1,650 
i| 10, 163 
| : | | 
| 
