GROUND-WOOD PULP. Wa 
yields a shorter fibered pulp, with a color inferior to that obtained 
from the green material. Green wood likewise requires less power 
to grind it, although the difference in the power consumption per ton 
between that obtained from green and seasoned wood is very small. 
The weight per cubic foot of wood is a most important factor, 
since upon it depends almost entirely the yield per cord. This is 
best shown in figure 20, where the dry weights of a number of dif- 
ferent species are plotted against the yield of pulp per 100 cubic 
feet of solid rossed wood. It has been found that the yield is almost 
directly proportional to the bone-dry weight per cubic foot. 
90 
Cals Dn el noe eer hha 
4 EC (A a) PU 
OSE DE ie ee eS ee ee ee 
HbR tt Ha a) clo OD os ed TN 
70 
a eae Pies a oS TI 
oe Aol lc 108 He Wl ak OC dy 
ee octa ome a eoce Gee PEE 
' 50 
il al age Gi iad | a il Pris 
eEEEEEHECEH] EEEHEEEH EEE EE 
SE IPRICRMRRE A CGT em Lem Wei Ae s|edde etl ts a 
Eo | ie Bee eo 
rem ly emer ae | Eerie as 
SO RCEIe J eeGe be teeroreed! (eceree noe 
F = 
AChE Fe 1 0 0 
[IC RI ae i a Fe a 
i bt a TV 9 
40 60 - 80 100 {120 250 300 350 400 450 
ae eae | 5 6 
HORSEPOWER PER TON [BONE DRY] HORSEPOWER TO GRINDER ‘TONS IN 24 HOURS [BONE DRY] 
Fic. 17.—Relation of power consumption and production to steaming pressure—horsepower to grinder 
constant. (Spruce runs 233 to 242, inclusive.) 
The following is a list of woods corresponding to the numbers shown 
on the curves in figure 20: 
No. 1. Balsam fir. No. 14. Western yellow pine. 
Dy ed tit), 15. Jack pine. 
3. White fir. 16. Loblolly pine (fall cut). 
4, Alpine fir. 17. Loblolly pine (spring cut). 
5. Amabilis fir. 18. White pine. 
6. Lowland fir. 19. Engelmann spruce (Montana). 
7. Noble fir. 20. Engelmann spruce (Colorado). 
8. Eastern hemlock. 21. Sitka spruce. 
9. Western hemlock. 22. White spruce. 
10. Tamarack. 23. White birch. 
11. Western larch. 24. Aspen.! 
12. Montana lodgepole pine. 25. Black gum. 
13. California lodgepole pine. 
1Commonly called ‘‘popple’”’ in Wisconsin. 
