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CHAPTER XIII.-On Roofs.

Load on Roofs

Strains on Roofs

Rafters, Strength of

Struts

Tie-rods

Keys, Rivets, &c., Strength of

Curved Roofs ..

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530

532

533

535

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539

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CHAPTER XIV.-ON THE TORSIONAL STRAIN.

Theoretical Laws

Ratio of Strength of Round to Square Sections

Practical Ru for Torsional Strength

Rectangular Sections

Hollow Sections

Old Rule for Torsional Strength

Wrought Iron

and Steel, Strength of

Shafting for Ordinary Machinery

Marine-engine Shafts

Crane Shafts

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