PRODUCTION OF SULPHITE PULP FROM SPRUCE. 



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Fig. 5.— Cooking curves for cooks 81, 86, 87, 88, and 89. 1, temperature; 2, gauge pressure; 3, gas pressure; 



4, steam pressure. 





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Fig. 6.— Cooking curves for cooks 90, 91, 92, and 94. 1, temperature; 2, gauge pressure; 3, gas pressure: 



4, steam pressure. 



