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The Pamphlet Collection of Sir Robert Stout: Volume 64

Notes on Table IV

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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—

8X6X12X12X207.5/12=119,520 lbs.=53 tons 7 cwts. 16 lbs.

When the load is confined to the centre, the beam breaks with half this weight.

page 180
Durability. Strength. Elasticity. Toughness. Weight. Lightness. Hardness. Softness. Kowhai .. .. Black Mapau .. Rata .. .. Cedar (?) .. Kowhai .. Cedar .. .. Rata .. .. Silver Birch. Broad leaf .. .. Manuka .. .. Manuka .. White Pine .. Black Pine .. Silver Birch .. Manuka .. White Pine. Fuchsia .. .. Kowhai .. .. Miro .. .. White Mapau .. .. Miro .. .. White Pine .. Fuchsia .. Cedar. Black Pine .. Red Birch .. .. Red Birch .. Totara .. Rata .. .. Celery Pine .. Grass Tree .. Celery Pine. Totara .. .. Miro .. .. Black Mapau .. Silver Birch .. Red Pine .. Pokaka .. Kowhai .. Red Birch. Cedar .. .. Rata .. .. Pokaka .. Kowhai .. Broadleaf .. Red Birch .. Broadleaf .. Kamai .. .. Red Mapau .. Kowhai .. Red Pine .. Turpentine .. Red Pine .. Kamai .. .. Bed Birch .. .. Black Pine .. Red Mapau .. Black Pine .. Yellow Pine .. Totara .. Black Pine .. Yellow Pine .. Celery Pine .. Rata and Black Black Heart Birch, Broadleaf, place Heart Birch are place not deter not deter also believed to mined .. .. mined. .. .. be durable, but their durability is not fully proved.

Table V. Properties and Uses of Otago Timbers—Approximately in order of Superiority and Fitness.

page 181
Piles. Beams. Sleepers. Planking. Framing, Implements, and Wheelwrights' Work. Teeth and Bearings. Patterns. Kowhai .. .. Red Birch .. .. Black Pine .. Black Pine .. Manuka .. .. Rata .. .. Silver Birch. Black Pine .. .. Black Heart Birch Totara .. .. Black Heart Birch Kowhai .. .. Kowhai .. .. White Pine. Kamai .. .. Black Pine .. Red Birch .. .. Kamai .. .. Rata .. .. Manuka .. .. Cedar. Totara .. .. Rata .. .. Kamai .. .. Red Birch .. .. Black Heart Birch Broadleaf .. .. Celery Pine. Black Heart Birch Kowhai .. .. Cedar .. .. Black Pine .. Rata .. .. Red Birch .. .. Cedar .. ..

Engineering Purposes.

Fencing and House Blocks. Framing. Beams and Joists. Flooring and Weather Boards. Internal Joiners' Work. Furniture. Red Birch .. .. White Pine .. .. Silver Birch .. .. Kamai. Black Heart Birch .. .. Silver Birch .. .. White Pine .. .. Black Heart Birch. Miro .. .. Red Birch .. .. Red Birch .. .. Miro. Black Pine .. .. Red Pine .. .. Celery Pine .. .. Red Pine. As per Durability List, All the Pines and Totara .. .. .. Rata. Table V. Birches. Totara .. .. Kowhai. Black Pine .. .. Pokaka. Miro .. .. .. Mapau. Red Pine .. .. Red Birch. Manuka.

Building Purposes and Furniture.

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