FACTORS AND TABLES OF EQUIVALENTS USED IN FORESTRY 19 



Table 30. — Comparison of log rules 



Top diam- 

 eter inside 

 bark 

 (inches) 



4_ 



5_ 

 8. 



8l 

 9_ 



10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 

 29 

 30 

 31 

 32 

 33 

 34 

 35 

 30 

 37 

 38 

 39 

 40 



Board foot values for 16-foot logs for log rules and in percentage of International 



Inter- 

 na- 

 tional 

 H 

 kerf 



lid 



ft. 



5 



10 



20 



30 



40 



50 



65 



80 



95 



115 



135 



160 



180 



205 



230 



260 



290 



320 



355 



390 



425 



460 



500 



540 



585 



630 



675 



720 



770 



820 



875 



925 



980 



1,040 



1,095 



1,155 



1,220 



Scribner 



Bd. 



ft. 



(10) 



(13) 



18 



24 



32 



42 



54 



64 



79 



97 



114 



142 



159 



185 



213 



240 



280 



304 



334 



377 



404 



459 



500 



548 



582 



609 



657 



710 



736 



784 



800 



876 



923 



1,029 



1,068 



1,120 



1,204 



Per- 

 cent 



200 

 130 

 90 

 80 

 80 

 84 

 83 

 80 

 83 

 84 

 84 

 89 

 88 

 90 

 93 

 92 

 97 

 95 

 94 

 97 

 95 

 100 

 100 

 101 

 99 

 97 

 97 

 99 

 96 

 96 

 91 

 95 

 94 



97 



Scribner 



Decimal 



C 



Bd. 



ft. 



(10) 



(10) 



20 



30 



30 



40 



60 



70 



80 



100 



110 



140 



160 



180 



210 



240 



280 



300 



330 



380 



400 



460 



500 



550 



580 



610 



660 



710 



740 



780 



800 



880 



920 



1,030 



1,070 



1,120 



1,200 



Per- 

 cent 

 200 

 100 

 100 

 100 

 75 

 80 

 92 

 88 

 84 

 87 

 81 

 88 

 89 

 88 

 91 

 92 

 97 

 94 

 93 



Spauld- 

 ing 



50 

 63 



77 

 94 

 114 

 137 

 161 

 188 

 2x6 

 245 

 276 

 308 

 341 

 376 

 412 

 449 

 488 

 528 

 569 

 612 

 656 

 701 

 748 

 796 

 845 

 897 

 950 

 1,006 

 1,064 

 1,124 

 1,185 



Per- 

 cent 



Doyle 



Bd. 



ft. 



225 



256 



289 



324 



361 



400 



441 



484 



529 



576 



625 



676 



728 



784 



841 



900 



961 



1,024 



1,089 



1,156 



1,225 



1,296 



Per- 

 cent 



Doyle and 

 Scribner 



1 



4 



9 



16 



25 



36 



49 



64 



81 



100 



121 



144 



169 



196 



225 



256 



289 



324 



361 



400 



441 



484 



530 



582 



609 



657 



710 



736 



784 



800 



876 



923 



1,029 



1,068 



1,120 



1,204 



Per- 



Ct lit 



Holland 

 or Maine 



Bd. 



ft. 



(3) 



(11) 



20 



31 



44 



52 



68 



83 



105 



120 



142 



161 



179 



205 



232 



271 



302 



336 



363 



401 



439 



477 



507 



546 



614 



657 



706 



755 



792 



848 



900 



949 



1,026 



1,089 



1,135 



1,209 



1,261 



Per- 

 cent 

 60 

 110 

 100 

 103 

 110 

 104 

 105 

 104 

 111 

 104 

 105 

 101 

 99 

 100 

 101 

 104 

 104 

 105 

 102 

 103 

 103 

 104 

 101 

 101 

 105 

 104 

 105 

 105 

 103 

 103 

 103 

 103 

 105 

 105 

 104 

 105 

 103 



Blodgett 

 or New 

 Hamp- 

 shire 



Bd. 



ft. 



13 



19 



26 



35 



43 



54 



66 



78 



92 



106 



123 



139 



157 



176 



197 



217 



240 



262 



287 



313 



339 



367 



397 



426 



457 



489 



514 



557 



592 



Per- 

 cent 

 260 

 190 

 130 

 117 

 108 

 108 

 102 

 98 

 97 

 92 

 91 

 87 

 87 

 86 

 86 

 83 

 83 

 82 

 81 

 80 

 80 

 80 

 79 

 79 

 78 

 78 

 76 

 77 

 77 

 77 

 76 

 76 

 76 

 75 

 76 

 75 

 75 



Hum- 

 phrey or 

 Vermont 



Bd. 



ft. 



11 



16 



24 



32 



43 



53 



67 



80 



96 



112 



131 



149 



171 



192 



216 



240 



267 



293 



323 



352 



384 



416 



451 



485 



523 



560 



600 



640 



683 



725 



771 



816 



864 



912 



963 



1,013 



1,067 



Per- 

 cent 

 220 

 160 

 120 

 107 

 108 

 106 

 103 

 100 

 101 

 97 

 97 

 93 

 95 

 94 

 94 

 92 

 92 

 92 

 91 

 90 

 90 

 90 

 90 

 90 

 89 

 89 



88 



International log rule for saws cutting a 24-inch kerf taken as a standard =100 percent. 



