12 
BULLETIN 80, U. S. DEPARTMENT OF AGRICULTURE. 
ing the first hour of cooking. The room temperature and the pres- 
sure of steam at digester inlet were kept as near constant as possible 
for all the tests, so that all conditions affecting condensation, aside 
from the cooking operation itself, would be uniform. For the same 
| STEAM MAIN 
AL KALI STORAGE TA NK 
CAUSTIC SODA LIQUOR 
storage! 
Fig. 2.— Flow sheet, showing course of material through the various stages of treatment and testing. 
reason, steam of approximately the same moisture content was used 
in all tests. 
During the first hour of cooking the digester pressure and tempera- 
ture were brought, at a uniform rate, up to the maximum to be 
