PRACTICE OF TIMBER ESTIMATING 
173 
examining trees as they are felled results as follows: — 
20 normal trees 17 to 20 inches in breast diameter when 
scaled by the above methods give 4730 feet B. M., while 
trees of the same dimensions are given in the volume table 
on page 238 5720 feet. The actual scale, therefore, is 17 
per cent less than the tabular values. 
24 trees 14 to 16 inches in diameter which by the table 
should yield 4080 feet scale up 3480, or 15 per cent less. 
30 trees 11 to 13 inches in diameter that by the table 
should yield 4380 feet, actually scale 3500, or 20 per cent 
less. 
The figures of the volume table may now be reduced by 
these percentages in those heights and sizes where on the 
given job the figures are required. The working table 
will then be as follows: 
Breast 
Diam. 
Inches 
Feet in Height 
50 
55 
60 
65 
70 
75 
11 
52 
56 
64 
72 
84 
92 
12 
60 
68 
80 
88 
96 
108 
13 
72 
80 
92 
100 
112 • 
125 
14 
85 
100 
110 
125 
140 
155 
15 
100 
115 
130 
145 
160 
175 
16 
130 
143 
155 
175 
190 
17 
142 
158 
175 
190 
210 
18 
155 
175 
195 
210 
230 
19 
175 
195 
215 
240 
265 
20 
195 
220 
245 
270 
295 
SECTION V 
PRACTICE OF TIMBER ESTIMATING 
The methods that should be employed in a survey of 
standing timber depend on a great variety of facts of which 
the main ones are these: the size of the tract to be ex¬ 
amined, the method and fineness of its subdivision, the 
variety in its stand of timber, the value of the timber, and 
the experience and qualifications of the estimator. These 
methods are best discussed in two divisions, — first, 
methods for small tracts with valuable timber as a rule; 
and second, those for large tracts where more extensive 
processes must be employed. 
