56 
BULLETIN 1036, U. S. DEPARTMENT OF AGRICULTURE. 
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Fig. 29.— Longitudinal penetration of oil of different viscosities into longleaf pine and noble fir. 
c — Longleaf pine sapwood. 
*— Noble fir. 
Max. curve — xy=6. 
Average curve — xy=3. 
Min. curve — xy=8. 
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