The book Testing the Hardness And Durability of Metals was written by author Harold Ralph Badger Here you can read free online of Testing the Hardness And Durability of Metals book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Testing the Hardness And Durability of Metals a good or bad book?
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In fact, the inventor was well-nigh on the point of giving up the method when he met the French expert on metals, Dr. Herault. Following out certain of his suggestions, the inventor succeeded in producing a satisfactory instru- ment for the testing of hardness. The difficulty with the ball-shaped hammer was that it was incapable of striking a sufficiently hard blow to get adequate results, especially with hardened tool steel, so the area of contact was reduced, although the weight was kept larg...e in com- parison. j Hardness vs. Elasticity When the hammer of the scleroscope is allowed to drop with no other force than its own weight, and the point is so flat that absolutely no impression is made on the surface of very hard steel, then the re- bound will be about 90 per cent of the fall. This phenomenon is known as the elasticity of solid bodies. Now, since hardness is resist- ance to penetration, in its clearest definition, it stands to reason that the point of the hammer must be somewhat reduced and rounded.
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