GROUND-WOOD PULP. 25 
The peripheral speed of the pulp stone influences the power con- 
sumption only slightly. The power consumption per ton decreases 
somewhat when the speed is increased (fig. 15). It is also shown that 
TONS IN 24 HOURS—BONE DRY 
(Spruce runs 24 to 27, inclusive.) 
HORSEPOWER TO GRINDER 
Fic. 15.—Relation of power consumption and rate of production to speed. 
HORSEPOWER PER TON—BONE DRY 
the horsepower to the grinder and production in 24 hours increase 
directly with the speed of the pulp stone. The speed has much less 
effect upon the quality of the pulp than either the pressure or surface 
