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1623. The table from which the above has been reduced to English measures, is extended to pieces of 31.980 in. square, and 47.97 ft. long; but as such scantlings rarely if ever occur in practice, unless strengthened by means of trussing, we have not considered it necessary to proceed beyond the scantling of 20-25 in. by 21 320 in., and 32 ft. long.

1624. Though the table is founded upon experiments on oak, it will serve for all sorts of wood, whose primitive strength is known, and the proportion they bear to oak. In order to facilitate calculations of that nature, the following table has been constructed, in which will be found the absolute and primitive strengths of the several sorts of timber, ordinarily used in carpentry, as also of some few others.

TABLE VII.

For applying the preceding Table to the Woods undermentioned. The primitive horizontal or transverse Strength of Oak is taken at 1000; its supporting or primitive vertical Strength at 807; and its cohesive or absolute Strength at 1821; being deduced from Pieces 19.188 lines English square.

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