This section is from the book "Elementary Principles Carpentry", by Thomas Tredgold. Also available from Amazon: Elementary Principles Of Carpentry.
Length. | Scantling. | Deflection. | Corresponding weight. | Weight with which it sank down. | Remarks. | ||
in. | in. | inches. | lbs. | lbs. | |||
58 | 2 | x | 2 | .03 | 3254 | ... | Bent in direction of diagonal, one end crushed about one inch from bottom, and in the middle, two. thirds or three-fourths of the area being crippled. |
... | ... | ... | .10 | 6505 | |||
... | ... | ... | .12 | 8857 | |||
... | ... | .... | .17 | 11209 | 12385 | ||
58 | 2 | x | 2 | .09 | 4153 | ||
... | ... | ... | .12 | 6505 | |||
... | ... | ... | .15 | 8857 | |||
.. | ... | ... | .32 | 11209 | 11601 | Crushed as before. | |
58 | 2.9 | x | 14 | .13 | 4153 | ... | Sunk by bending in the direction of the smaller side. |
... | ... | ... | .17 | 5329 | |||
.. | .. | ... | .25 | 6505 | 7681 | In another experiment a piece of the same size broke with somewhat less than this. | |
58 | 3.47 | x | 1.15 | .42 | 4155 | 4349 | Sunk by bending in the direction of the smaller side. |
* 'Phil Transactions,' 1840.
 
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