30 



BULLETIN 606, U. S. DEPARTMENT OF AGRICULTURE. 



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FOREST PRODUCTS LABORATORY 























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aioisoa. 









3-'f 



.1915 



25 5© 75 300 (25 



PRESSURE -LS3, PER S<3. IN, 



Pig. 16. — Absorption in the heartwood of chestnut oak and red oak. 



Table 3. — Results of penetrance tests on individual pieces. 



ROCK ELM— HEARTWOOD. 





Mois- 

 ture. 



Aver- 

 age 

 num- 

 ber of 

 rings 

 per 

 inch. 



Oven 



dry 



weight 



per 



cubic 

 feet. 



Time of 

 treat- 

 ment. 



Time required 



to penetrate 



24 inches. 1 



Penetrations. 



Piece No. 



First 

 end. 



Second 

 end. 



Aver- 

 age 

 lon- 

 gitu- 

 dinal. 



Radial. 



Tangential. 





Aver- 

 age. 



Maxi- 

 mum. 



Aver- 

 age. 



Inches. 



0.25 



.30 



.40 



Maxi- 

 mum. 



48 



Per ct. 

 6.1 

 2.0 



14 

 16 

 14 



Pounds. 

 38.40 

 37.20 

 39.80 



Hours. 



i 

 1 

 2 



Min. 

 2 

 x 



2 



Mm. 

 3 

 1 

 5 



Indies. 

 5.83 

 11.65 

 5.50 



Inches. 

 0.20 



.40 

 .40 



Inches. 



0.30 



.50 



.50 



Indies. 

 0.30 



49 



.60 



50 



.60 











7.65 



.33 



.43 



.32 .50 





























RED BIRCH— HEARTWOOD. 











51 



12.0 

 9.7 

 6.5 



18 

 14 

 13 



39.60 

 39.30 

 38.50 



J. 



2 



1 



2 







8.50 

 8.17 

 8.43 



0.30 

 .25 

 .25 



0.35 

 .30 



.35 ! 



0.30 

 .25 

 .30 



0.40 



52 



35 

 25 





.30 



53 



.40 









8.37 



.27 



.33 



.28 



.37 

















SWEET UIRCH 2 — HEARTWOOD. 



57 







20 

 21 

 18 



47.10 

 47. 12 

 44.62 



i 



1 

 2 







4.17 

 3.83 

 3.56 1 



0.30 

 .40 



.25 



0. 35 

 .50 

 .25 



0.25 

 .40 

 .25 



0.30 



58 









.50 



59 



12.2 







.30 







. . . 







3.85 1 



.32 



.37 



.30 



.37 



















1 These periods are not comparable to those obtained in commercial treating plants. 



2 Specimens were crooked grain. Oil passed out at side instead of following to end, as it would have done 

 in straight-grained wood. 



