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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...increase is less, and markedly so, is submitted as an indication that the abovementioned theory’ is not sufficient to explain the change of properties caused by the plastic deformation. PAUL D. l/IERroa.--It is a stress that does not produce a permanent set, so far as we can observe it. Joan A. Mzvrr-11nws.--Do you think there is a feasible method of determining the elastic stress by magnetic arrangement? PAUL D. Mnaro.1.--It is certainly feasible, but I think the Martin extensometer is much more convenient. LEONARD WAL10.--It would be a great comfort to know that Martin's extensometer is in use in the United States. I was very much impressed with the very great certitude of the results under stress afforded by the reflecting extensometer of Martin. So far I have never met it in practical works and I am very glad indeed that the Bureau of Standards has set the example for its use. t The Efiect of Carbon on the Physical Properties of Heat-Treated Carbon Steel‘ THE experiments herein described were undertaken with a view to investigating thoroughly the influence of carbon on the tensile and impact physical properties of carbon steel. The original comprehensive plan included investigation of a series of steels with varying carbon contents over a wide range of heat treatments. These were to be studied as to their static tensile qualities, and also their resistance to shock as measured by the Charpy impact bending test. A thorough metallographic examination was likewise included in the schedule. The Charpy tests and the metallographic examination have not been completed to date, and are accordingly withheld for another report. All heat treatments, however, have been made, and the static tensile tests have been completed. A...
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