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International Library of Technology: A Series of Textbooks for Persons Engaged in the Engineering Professions and Trades or for Those Who Desire ... Practical Examples and Their Solutions - Softcover

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9780282633110: International Library of Technology: A Series of Textbooks for Persons Engaged in the Engineering Professions and Trades or for Those Who Desire ... Practical Examples and Their Solutions

Synopsis

Excerpt from International Library of Technology: A Series of Textbooks for Persons Engaged in the Engineering Professions and Trades or for Those Who Desire Information Concerning Them, Fully Illustrated and Containing Numerous Practical Examples and Their Solutions

In a radiator, the thickness of the metal is of smallflimpor tance, mainly because the temperatures are low; but in a boiler, where the parts are exposed to intense heat, it is important that the metal should be as thin as practicable. If the metal is thick, one surface is likely to be much hotter than the other, and the inequality of the expansion causes stresses that tend to bulge or crack the plates. In a very thick plate, while the surface next to the water remains uninjured, the surface exposed to the hot fire is likely to be overheated and burned, and the plate thus becomes rapidly weakened. A thin steel tube, when full of water, may be exposed to the fiercest fire without injury, provided there is not an excessive internal pressure.

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