The Materials of Construction. a Treatise for Engineers On the Strength of Engineering Matierials
The Materials of Construction. a Treatise for Engineers On the Strength of Engineering Matierials
Johnson, J. B. (John Butler), 1850-1902
The book The Materials of Construction. a Treatise for Engineers On the Strength of Engineering Matierials was written by author Johnson, J. B. (John Butler), 1850-1902 Here you can read free online of The Materials of Construction. a Treatise for Engineers On the Strength of Engineering Matierials book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Materials of Construction. a Treatise for Engineers On the Strength of Engineering Matierials a good or bad book?
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292. That is, as far as possible, the entire energy of the blow should pass into the specimen. The falling weight should be held to its course either by vertical guides, in the case of a falling weight, or by a pendulum mounted on a transverse axis resting on knife-edge bearings. The former method is to be preferred. The falling weight should be sym- metrical in form, with suitable guiding attachments, to be formed (cast) in one piece, of hard metal, with its centre of gravity as low as possibl...e. The height of the weight should be greater than the width between the guides, which latter should be quite rigid, true, and vertical, and should offer no frictional resistance to the falling weight. The supporting mass should be very great as compared to that of the falling weight. The French Commis- sion recommend that it be at least 15 or 20 times that of the striking body. Impact tests can only be standardized by using exactly similar appliances in all respects, including the supporting blocks and the foundation on which these supports rest.
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