GROUND-WOOD PULP. 



23 



steamed at varying pressures for periods of three and six hours and 

 then ground in two pockets of the grinder at a cylinder pressure of 

 60 pounds per square inch. The power to the grinder was main- 

 tained at 345 horsepower, and it was utilized by adjusting the periph- 







































































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eral speed of the stone to such a value as was necessary for the sample 

 being tested. When wood which had been steamed for 6 hours at 

 75 pounds pressure was ground a cylinder pressure of 60 pounds on 

 two pockets and speed of 225 revolutions per minute were necessary 



