58 BULLETIN 80, U. S. DEPARTMENT OF AGRICULTURE. 



Table 15. — Cooking conditions and results of autoclave tests on aspen — Continued. 





Duration of cooking. 



Maxi- 

 mum 

 gauge 

 pressure 



per 

 square 

 inch. 



Yields (bone-dry basis). 



Properties of unbleached 

 pulps. 1 



Cook 

 No. 



Total. 



At zero 

 gauge 

 pres- 

 sure. 



At 

 maxi- 

 mum 

 gauge 

 pres- 

 sure. 



Total 

 crude 

 pulp. 



Screen- 

 ings. 



Screened 

 pulp. 



Ash. 



Bleach 

 required. 



Loss on 

 bleach- 

 ing. 



1 

 2 

 3 

 4 

 5 



Hrs. 

 8.2 

 8.5 

 4.5 

 8.0 

 8.0 



Hrs. 

 0.3 

 .3 

 .3 

 .2 

 .3 



Hrs. 



7.0 

 7.0 



3.0 

 7.0 

 7.0 



Lbs. 



110 

 110 

 110 

 110 

 110 



P. ct. 

 41.10 

 44.23 

 40.50 

 46.97 

 36.00 



P. ct. 

 0.10 

 .03 

 .10 

 .07 

 .00 



P.ct. 

 41.00 

 44.20 

 40.40 

 46.90 

 36.00 



P.ct. 



1.40 

 1.27 

 1.35 

 1.25 

 1.42 



P.ct. 

 15.4 

 14.7 

 14.3 

 15.8 

 10.0 



P. ct. 

 3.92 

 4.08 

 4.39 

 4.68 

 2.56 



(P. L.— 66— 1, S. 683.) 

 1 The pulps produced were of good strength and of a fair degree of hardness; the color was very light 

 reddish-brown. Shives were very few in number or almost absent. 



