18 BULLETIN 343, U. S. DEPARTMENT OF AGRICULTURE. 
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£2492 FET al OF MEam = 
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3. Steamed spruce runs 172-176, inclusive. 
220 240 260 280 
180 
HORSEPOWER PER TON [BONE DRY] 
aaa 
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inclusive. 
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160 
Seige INGEN Serie aae 
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oe 
Fia. 9.—Relation of power consumption and rate of production to pressure. 
“NI ‘OS usa SONNOd = ‘uaqnruaa HON ps no meena 
