800 



BELL SYSTEM TECHNICAL JOURNAL 



90 



CO 80 



70 



60 



50 



Hi? 40 



30 



20 



70,000 80.000 90,000 100,000 110,000 120.000 130.000 

 TENSILE STRENGTH -PSI 



Fig. 26 — Compaiison of Curves of Results from Experience Data with Limits 

 Adopted, for Alloy C Phosphor-Bronze Sheet. 



Conclusion 



The purposes stated in this paper have been accomplished, namely, 

 the development of a commercial method of test for sheet non- 

 ferrous metals and limits for use in commercial specifications. 



The conclusion reached that the tension test is the best available 

 static test for non-ferrous sheet metal in the hard tempers has been 

 confirmed. 



Because of its close correlation to the tension test, the Rockwell 

 hardness test has been adopted for preliminary inspection purposes. 

 Other hardness tests have been studied but this test is the most 

 satisfactory for sheet metals 0.020 in. thick and thicker. It has limited 

 use for material less than 0.020 in. thick. Material near to or outside 



