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A bar of cast iron, when at its breaking point by the application of a tensile strain, is stretched about one six-hundredth part of its length; and an equal strain employed to compress it, would shorten it about one eight-hundredth part of its length. Q. But to what strain may the iron used in the construction of engines be safely subjected?
In the next place, in what way would old age have been less disagreeable to them if they were in their eight-hundredth year than in their eightieth? For their past, however long, when once it was past, would have no consolation for a stupid old age.
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