MILL TALLIES 
151 
TABLE OF LOSS BY HOLES OR ROT NEAR THE CENTER 
OF LOGS, GOOD FOR DEFECTS MORE THAN 4 
INCHES FROM THE BARK 
Diam. 
of Hole 
Length of Logs in Feet 
10 
12 
14 
16 
18 
20 
Inches 
Board Feet 
2 
5 
6 
7 
8 
9 
10 
3 
9 
11 
13 
15 
16 
18 
4 
14 
17 
20 
23 
25 
28 
5 
20 
24 
28 
32 
36 
40 
6 
27 
33 
38 
44 
49 
55 
7 
36 
43 
50 
57 
65 
72 
8 
45 
54 
63 
72 
81 
90 
9 
56 
67 
78 
89 
100 
112 
10 
67 
81 
93 
107 
120 
133 
on arbitrary rules or on guesswork. Proper discount may 
vary greatly, too, with the mill practice and product. A 
mill with a box factory attached, or sawing round-edged 
stuff which is measured regardless of crooks, wastes little 
or nothing on account of defective form. For a mill 
which can market only three-inch deals at a profit, an 
entirely different system of scaling is appropriate. 
SECTION VII 
MILL TALLIES 
Thousands of unrecorded tests of scale rules have doubt¬ 
less been made at the saw, using local and current scaling 
and sawing methods. During the last few years a number 
*of such tests have been made under stated conditions so 
carefully guarded that they may serve a general purpose. 
Reference is made to the tests recorded on pages 143 and 
144 of this work. The following also are reliable and of 
interest to northern workers in timber. 
The wide variation in the yield of logs as sawed under 
different conditions is a matter of great importance in 
several ways to the worker in timber, chiefly, perhaps, for 
its bearing upon timber estimates. The relative compe- 
