GEOUND-WOOD PULP. 



21 



Figure 12 shows the effect of increasing pressure on the yield per 

 100 cuhic feet of solid rosscd wood. There is a material increase in 



8 S 



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the amount of pulp produced from this quantity of wood if the pres- 

 sure of grinding is increased from 20 pounds per square inch on a 

 14-inch cylinder to 100 pounds. 



