Show or the study of alis biography ot of structural metals is toe the new new science now being studied by six eminent scientists from as many different countries who are devoting their lives safeguarding of human life through removing rei roving the detects defects in steel rails gird gerdor ar beams and all manner of according to 11 H howe the american member of the committee the study has so BO far advanced that it is now possible to tell by what method every step in the construction of a piece of steel was accomplished it is dono done by sawing off a cross section of the rail or girder polishing poil shing the end to a like brightness treating it 11 with strong acid and observing the effect through the microscope overheating in the furnaces too rapid or too slow cooling and other errors in manufacture are easily detected mr howe says that the method would be successful in the study of a piece of iron cast 2000 years ago |