244 



STRENGTH OF MATERIALS 



195. Standard form of test specimens. It was pointed out in 

 Article 20 that the form of the test specimen had considerable effect 

 upon the results obtained from tests. To eliminate this factor, standard 



n. 



Pie. 163 



dimensions for both cylindrical and rectangular test specimens have 

 been adopted. These are shown in Fiu. 153. 



196. Specifications for wrought iron and steel. In order that t) it- 

 student may form some idea of the strength required by iuanu!a- 

 turers for different grades of wrought iron and steel, quotations are 

 uiven below from the proposed sjn-ei Heat ions of the American 

 for Testing Materials. 



RTBOUGHT EBOH 



STEEL 



