The Pamphlet Collection of Sir Robert Stout: Volume 64
Notes on Table IV
Notes on Table IV.
The "strength" given in column S is the weight in pounds required to break pieces twelve inches long and one inch square supported at one end and loaded at the other.
"Elasticity" is the greatest weight in pounds carried with unimpaired elasticity, divided by the deflection caused by it in inches, the specimen being the same size and loaded as above.
"Toughness" is the breaking weight given in column S divided by the deflection caused by it in inches at the instant of rupture. By this method the lowest tabular number indicates the greatest toughness.
Rule.—To find the breaking weight of a beam from the table, multiply together eight times the breadth of the beam in inches, the square of its depth in inches, and the tabular number S, the result divided by the distance between the supports in feet gives the breaking weight in pounds distributed over the entire length of the beam.
Example.— A kowhai beam twelve feet long between the supports, twelve inches deep and six inches broad, will break with 53 tons 7 cwts. 16 lbs., thus—
When the load is confined to the centre, the beam breaks with half this weight.
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