296 THE BOOK OF FORESTRY 
DOYLE LOG RULE 
Loa Lenatu In Fret 
Diameter of 
ineves tat 8 | 10 | 12 | 14 | 16 
small end 
inside bark). 
Contents 1n Boarp Fret. 
6 2.0 2.5 3.0 3.5 4.0 
7 4.5 5.6 6.8 7.9 9.0 
8 8 * 10 12 14 16 
9 12 16 19 22 25 
10 18' 23 27 32 36 
11 24) 31 37 43 49 
12 32s 40 48 56 64 
13 40+ 50 61 71 81 
14 504 62 75 88 100 
15 60° 75 91 106 121 
16 72k 90 108 126 144 
17 84+ 106 127 148 169 
18 98 122 147 171 196 
19 112 141 169 197 225 
20 128 160 192 224. 256 
21 144 181 217 253 289 
22 162 202 243 283 324 
23 180 226 271 313 359 
24. 200 200 300 350 400 
25 220 276 331 386 441 
26 242, 302 363 423 484 
27 264 330 397 463 530 
28 288 360 432 504 576 
29 312 ool 469 547 625 
30 338 422 507 591 676 
31 364 456 547 638 729 
32 392 490 588 686 184, 
33 420 526 631 736 841 
34 450 562 675 787 900 
35 480 601 721 841 961 
36 512 640 768 896 1024 
~ 
Norz.—In the United States and Canada there are many log rules in actual 
use; many of these, however, are of purely local importance. These rules 
are intended to give the contents in board feet or other units of logs of dif- 
ferent diameters and lengths. Ordinarily logs are measured in the woods 
by the scaler, who uses a three-foot hickory rule upon which the figures given 
in the log rule are burned. He measures the log at the small end inside the 
bark, estimates the log length in even feet by his eye, reads from the figures 
on the scale stick the contents of a log of that size and records the amounts 
in a note book. a 
