COMPAEATIVE FORM FACTOES. 17 



Table 6. — Volume growth of western yellow pine, Douglas fir, and blue spruce. 



Age. 



Diameter breast 

 high outside bark. 



Number 16-foot 

 logs 8-inch top di- 

 ameter limit. 



Merchantable volume. 



Total volume. 



Pine. 



Fir. 



Spruce. 



Pine. 



Fir. 



Spruce. 



Pine. 



Fir. 



Spruce. 



Pine. 



Fir. 



Spruce. 



Years. 

 10 

 20 

 30 

 40 

 50 

 60 

 70 

 80 

 90 

 100 

 110 

 120 

 130 

 140 

 150 

 160 

 170 

 180 

 190 

 200 

 210 

 220 

 230 

 240 

 250 

 260 

 270 

 280 

 290 

 300 

 310 

 320 

 330 

 340 

 350 

 360 



Ins. 

 0.6 

 1.3 

 2.2 



3.4 

 4.6 

 6.0 

 7.5 

 9.0 

 10.5 

 12.0 

 13.4 

 14.8 

 16.2 

 17.5 

 18.8 

 20.0 

 21.2 

 22.4 

 23.6 

 24.7 

 25.8 

 26.9 

 27.9 

 28.9 

 29.8 

 30.6 

 31.4 

 32.2 

 32.9 

 33.5 

 34.1 

 34.7 

 35.2 

 35.7 

 30.2 

 36.6 



Ins. 

 0.6 

 1.4 

 2.3 

 3.4 

 4.6 

 6.0 

 7.4 

 9.0 

 10.6 

 12.2 

 13.9 

 15.6 

 17.2 

 18.8 

 20.4 

 22.0 

 23.5 

 25.0 

 26.4 

 27.7 

 28.9 

 30.1 

 31.2 

 32.1 

 33.1 

 34.0 

 34.8 

 35.6 

 36.4 

 37.2 

 37.8 

 38.3 



Inches. 

 0.4 

 1.1 

 2.2 

 3.8 

 6.0 

 9.2 

 12.3 

 14.8 

 16.8 

 18.4 

 19.8 

 21.0 

 22.0 

 22.8 

 23.5 









Bd. ft. 



Bd. ft. 



Bd.ft. 



Cu. ft. 



Cu.ft. 



Cu.ft. 















0.02 



.10 



.35 



.84 



1.86 



3.63 



6.85 



10.56 



15.32 



21.56 



29.23 



38.51 



48.77 



59.40 



71.79 



84. 86 



98.21 



112.47 



127. 58 



142.83 



158. 17 



173.67 



189. 32 



204. 05 



219. 94 



235. 67 



250. 99 



265. 81 



280. 04 



293. 46 



306. 55 



319.20 



331.21 



342. 68 



353. 55 



0.02 



.11 



.37 



.96 



2.12 



3.98 



6.73 



10.45 



15.49 



22.28 



30.11 



39.03 



49.25 



59. 47 



71.63 



84, 51 



97.98 



112.04 



126. 65 



141.77 



157.37 



173. 34 



189. 62 



206. 13 



222. 85 



239. 27 



255. 28 

 270. 82 

 285. 82 

 300. 13 

 313.72 



0.02 



.10 



.46 



1.74 



5.92 



13.54 



21.23 



30.20 



39.24 



50.16 



61.36 



73.13 



85.10 



97.27 























































........ 



















50 

 100 

 150 

 200 

 260 

 360 

 390 

 440 







1.7 

 2.2 

 2.8 

 3.2 

 3.6 

 3.9 

 4.1 







1.1 

 1.6 



2.1 

 2.6 

 3.0 

 3.3 

 3.6 

 3.9 

 4.2 

 4.4 

 4.6 

 4.8 

 5.0 

 5.1 

 5.3 

 5.4 

 5.6 

 5.7 

 5.8 

 6.0 

 6.1 

 6.2 

 6.2 

 6.3 

 6.4 

 6.4 

 6.5 



1.2 



1.7 

 2.1 

 2.6 

 3.0 

 3.3 

 3.6 

 3.9 

 4.1 

 4.3 

 4.5 

 4.7 

 4.9 

 5.1 

 5.3 

 5.4 

 5.6 

 5.7 

 5.9 

 6.0 

 6.1 

 6.2 

 6.2 



40 



80 



110 



150 



210 



270 



360 



430 



510 



600 



720 



810 



920 



1,040 



1, 130 



1,220 



1,400 



1,470 



1,550 



1 , 680 



1,780 



1,920 



1,990 



2,090 



2,160 



2,270 



2,350 



30 



70 



110 



150 



210 



270 



340 



430 



500 



600 



710 



800 



920 



1,020 



1,130 



1,230 



1,370 



] , 460 



1,620 



1,730 



1,840 



1,940 



2,030 























































COMPARATIVE FORM FACTORS. 



Table 7, which is based upon age, gives for each decade after a 

 merchantable size is reached the form factors for western yellow 

 pine, Douglas fir, and blue spruce. In addition, the total height and 

 diameter are shown at each 10-year interval. 



