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The Mechanical Properties of Wood - Including a Discussion of the Factors Affecting the Mechanical - Properties, and Methods of Timber Testing by Samuel J. Record
page 31 of 237 (13%)

of wood, pp. 42, 89-90.]

|-------------------------------------------------------------------------------|
| TABLE V |
|-------------------------------------------------------------------------------|
| RELATION OF FIBRE STRESS AT ELASTIC LIMIT (r) IN BENDING TO THE CRUSHING |
| STRENGTH (C) OF BLOCKS CUT THEREFROM, IN POUNDS PER SQUARE INCH |
| (Forest Service Bul. 70, p. 90) |
|-------------------------------------------------------------------------------|
| LONGLEAF PINE |
|-------------------------------------------------------------------------------|
| | Soaked | Green | 14 | 11.5 | 9.5 | Kiln-dry |
| MOISTURE CONDITION | 50 per | 23 per | per | per | per | 6.2 per |
| | cent | cent | cent | cent | cent | cent |
| -------------------------+--------+--------+-------+-------+-------+----------|
| Number of tests averaged | 5 | 5 | 5 | 5 | 4 | 5 |
| _r_ in bending | 4,920 | 5,944 | 6,924 | 7,852 | 9,280 | 11,550 |
| _C_ in compression | 4,668 | 5,100 | 6,466 | 7,466 | 8,985 | 10,910 |
| Per cent _r_ is in | | | | | | |
| excess of _C_ | 5.5 | 16.5 | 7.1 | 5.2 | 3.3 | 5.9 |
|-------------------------------------------------------------------------------|
| SPRUCE |
|-------------------------------------------------------------------------------|
| | Soaked | Green | 10 | 8.1 | Kiln-dry |
| MOISTURE CONDITION | 30 per | 30 per | per | per | 3.9 per |
| | cent | cent | cent | cent | cent |
|----------------------------------+--------+--------+-------+-------+----------|
| Number of tests averaged | 5 | 4 | 5 | 3 | 4 |
| _r_ in bending | 3,002 | 3,362 | 6,458 | 8,400 | 10,170 |
| _C_ in compression | 2,680 | 3,025 | 6,120 | 7,610 | 9,335 |