PRACTICE OF TIMBER ESTIMATING 
191 
able size are included, or from 15 to 25 acres if the small trees also 
are calipered. Small trees are measured principally in studying 
the question of future growth. 
FORM OF NOTES 
Local ity.. T. 5. R.18+. JE.E..L.S. r Maine. _ 
Type-Hardwood, Slope. ~D at eSept..17^.19 01 
Sheet No. A. 41 
D.B.H. 
Spruce 
Dead 
Fir 
White 
Birch 
Beech 
Hard 
Maple 
Pine 
Popl. 
2 in. 
Rin 
M 
. 
3 “ 
r:. 
4 “ 
M. 
• 
5 “ 
FT. 
6 “ 
M.. 
• 
7 “ 
11 
W 
. 
8 “ 
M. 
9 “ 
m:. 
. 
M. 
10 “ 
11 “ 
. 
; 
: 
On large tracts satisfactory estimates can be made by the 
measurement of about 1 out of every 30 acres. In very extensive 
forest tracts the Bureau of Forestry usually measures not more 
than one or two out of every hundred acres. 
This method is clearly adapted to securing knowledge 
of the make-up of a forest, and of its stand of merchant¬ 
able timber if good volume tables are at hand to go with 
it. In the latter connection perhaps the greatest difficulty 
that arises is in applying the proper heights to the different 
diameters. This is slight if the tract is of small size and 
uniform character, but considerable on large tracts with 
uneven topography and varying stand. In addition con¬ 
stant care is required to make sure that the strip is kept 
of right width, in other words that all trees less than 2 
rods from the line run are included and none at a greater 
distance. Careful men do indeed quickly get trained to 
