. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . 100. Fig. 268 f » f ,v ) ;•■■■ I • i I I I. »• k 1.1 . • • • View 4. Longitudinal Section on Top of Portion B,Mag. 50, Unetched.Crushed Head. (Continued.) * The deleterious influence of slag inclosures in steel has perhaps escapedattention to some extent owing to the fact that in ordinary tensile tests, takenin a direction parallel to that of rolling, these inclosures only occupy a verysmall proportion of cross-sectional area and possess a tapered shape which a
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. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . 100. Fig. 268 f » f , v ) ;•■■■ I • i I I I. »• k 1.1 . • • • View 4. Longitudinal Section on Top of Portion B, Mag. 50, Unetched.Crushed Head. (Continued.) * The deleterious influence of slag inclosures in steel has perhaps escapedattention to some extent owing to the fact that in ordinary tensile tests, takenin a direction parallel to that of rolling, these inclosures only occupy a verysmall proportion of cross-sectional area and possess a tapered shape which allowsof gradual distribution of the stresses imposed on the material. If, however, weconsider the case of transverse stresses, or of shock or vibration, it will be seenthat these inclosures will be fractured as soon as the metal undergoes any materialdeformation, and then each such inclosure practically represents an internal * Slag Inclosures in Steel, by Walter Rosenhain. International Association for TestingMaterials, 5th Congress, Copenhagen, 1909. McGraw-Hill Book Company, New York. 394 STEEL RAILS. INFLUENCE OF DETAIL OF MANUFACTURE 395 fissure which is ready to extend — and actually does extend — in any directioncompatible with the applied stresses.