GROUND-WOOD PULP. 



55 



1. Noble fir. 



2. White spruce. 



3. Amabilis fir. 



4. Engelmaim spruce. 



5. Western hemlock. 



6. Sitka spruce. 



7. Balsam fir. 



8. Lowland fir. 



9. Bed fir. 



10. Montana lodgepole pine. 



11. White fir. 



12. Alpine fir. 



13. California lodgepole pine. 



14. White pine 



15. Western yellow pine. 



16. Tamarack. 



17. Jack pine. 



18. Loblolly pine. 



19. Hemlock. 



20. Larch. 



21. Aspen. 



22. Black gum. 



23. Birch. 



COMMERCIAL MANUFACTURE OF PAPER. 



To secure reliable data on the operation of the pulps on the paper 

 machine approximately 5,000 pounds of bone-dry pulp were manu- 

 factured from each kind of wood. At the start 5 tons of pulp were 

 made, but it was found later that the smaller amount would be 

 sufficient for the purpose of the test. The papers were made at the 

 mills of the Rhinelander Paper Co., Rhinelander, Wis., and the 

 Nekoosa-Edwards Paper Co., Port Edwards, Wis. The woods and 

 mixtures of woods used were as follows: 



Jack pine, green. 



Jack pine, seasoned. • 



Hemlock. 



One-third spruce, two-thirds hem- 

 lock. 



One-third spruce, one-third hemlock, 

 and one-third jack pine. 



Two-thirds hemlock, one-third jack 

 pine. 



1. Spruce. 



2. Western hemlock. 



3. Sitka spruce. 



4. Montana lodgepole pine. 



5. Western yellow pine. 



6. Balsam fir. 



7. California lodgepole pine. 



8. Bed fir. 



9. One-half spruce and one-half hem- 



lock. 



10. One-half balsam fir and one-half 



spruce. 



11. Tamarack. 



12. One-half tamarack and one-half 



spruce. 



13. Noble fir. 



14. Alpine fir. 



15. White spruce. 



16. Engelmann spruce (Colorado). 



17. Amabilis fir. 



As the former group of tests has been previously reported upon 

 (Forest Service Bulletin, "Experiments with Jack Pine and Hemlock 

 for Mechanical Pulp"), only the last 17 papers manufactured at the 

 Nekoosa-Edwards Paper Co. will be considered. 



Table 57 gives the results of the commercial runs. Samples of the 

 printed and imprinted sheets accompany this bulletin. 



For the first 12 runs the same furnish of ground wood and sulphite 

 to the beater was used in each case, the pulp consisting of quick-cook 

 hemlock sulphite 25 per cent and experimental ground wood 75 per 

 cent. In the last five tests the pulp was made up of 20 per cent of 



