BOARD MEASURE 
141 
factory results. In some matters, especially culling for 
defects, latitude must be allowed to the scaler. In general, 
however, practice is weak in the direction of strict mechan¬ 
ical accuracy. Reference is made to section VI following. 
The method of construction, field of use, and relation to 
saw product of the above named rules are as follows: 
2. Scribner and Decimal Rules. The figures of the 
original Scribner rule were obtained by drawing diagrams 
of the end sections of logs 12 to 48 inches in diameter and 
the boards which in the mill practice of the time could be 
sawed out of them. It is a very old rule and in wide use. 
As printed, extended down to 6 inches, it is the legal rule 
in the state of Minnesota. 
Omitting unit figures of the Scribner rule and taking the 
nearest tens has given the Decimal rule, so called, legal in 
Wisconsin and adopted by the United States Forest 
Service. 
3. Spaulding or Columbia River Rule. This rule was 
derived by similar methods as the preceding, j inch being 
allowed for saw kerf. It is in more extensive use on the 
Pacific Coast than any other. 
4. Doyle Rule. This rule was constructed by the fol¬ 
lowing formula: — Deduct 4 inches from the diameter of 
Diameter 
No. Logs 
Doyle 
Scale 
Product 
Overrun 
6-8 in. 
28 
289 
903 
213% 
7-9 in. 
54 
831 
2159 
159% 
8-12 in. 
101 
2603 
5471 
110% 
10-17 in. 
104 
6324 
9976 
58% 
18-20 in. 
90 
15440 
20215 
31% 
21-24 in. 
126 
30929 
37744 
22% 
25-33 in. 
31 
11866 
13368 
12% 
the log for slab, square \ of the remainder, and multiply 
by the length of the log in feet. This is a very illogical 
rule and gives results widely varying from saw product in 
