58 BULLETIN 80, U. S. DEPARTMENT OE 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.) 
i 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. 
