The above photographs show the most severe test of ductility and quality to which a piece 

 of steel may be subjected; strands of "Steelcrete" mesh bent flat upon themselves through an 

 angle of 180 degrees without any indication of fracture. 



This method of testing is cited by Johnson in "The Materials of Construction" as ap- 

 proaching more nearly to the severe usages of actual practice than does the tension test, with 

 its elastic limit, ultimate strength, elongation and reduction of area. 



In referring to the value of the cold bend test, Professor Merriman states that if all tests 

 of metal except one were abandoned, the cold bend test should be retained. It should be remem- 

 bered that this test may be made by anyone at any time in the field. 



174 



