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25 50 75 TOO 125 
PRESSURE- LBS. PER SG. iN. 
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RED OAK 
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FOREST PRODUCTS LABORATORY 
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25 50 75 100 125 
PRESSURE -LBS. PER 3d. IN, 
Fig. 16. 
150 
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. 
Maxi- 
mum. 
48 
Per ct. 
6.1 
2.0 
14 
16 
14 
Pounds. 
38.40 
37.20 
39.80 
Hours. 
2 
Mm. 
2 
} 
2 
Mm. 
3 
1 
5 
Inches. 
5.83 
11.65 
5.50 
Incites. 
0.20 
.40 
.40 
Inches. 
0.30 
.50 
.50 
Inches. 
0.25 
.30 
.40 
Inches. 
0.30 
49 
.60 
50 
.60 
7.66 
.33 
.43 
.32 
.50 
RED BIRCH— HEARTWOOD. 
51 
12.0 
9.7 
6.5 
18 
14 
13 
39.60 
39.30 
38.50 
1" 
2 
8.50 
8.17 
8.43 
0.30 
.25 
.25 
0.35 ! 
.30 i 
.35 
0.30 
.25 
.30 
0.40 
52 
35 
.30 
53 
25 
.40 
8.37 
.27 
.33 | 
.28 
.37 
• 
SWEET BIRCH -—HEARTWOOD. 
57 
20 
21 
18 
47. 10 
47. 12 | 
44.62 
1. . 
2 
4.17 
3. S3 
3.56 
0.30 
.40 
.25 
0.35 
.50 
.25 
0.25 
.40 
.25 
0.30 
58 
.50 
59 
12.2 
.30 
3.85 
.32 
.37 
.30 
.37 
1 

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. 
