384 



CAST IRON. 



In the third set the iron used was of a very fluid 

 nature, such as is suitable for light machinery castings, 

 and having a composition of 3 -52 per cent, free carbon, 

 0'32 combined carbon, 2-04 silicon, 0*39 manganese, 

 0-58 phosphorus, and 0*044 sulphur. 



TO 7T 



5-CT 



75 



1 o 



It) 



Load .Tons per square inch. 

 FIG. 185. LOAD-STRAIN CURVE FOR CAST IRON IN TENSION AND COMPRESSION. 



The specimens were in. cubes, cut from different 

 parts of bars of larger section. The results were as 

 follow : 



COMPRESSION TESTS OF IN. CUBES OF LIGHT 

 MACHINERY IRON. 



Cross Section 



Crushing Strength, in tons per square inch, for Cube. 



These tests also plainly show that the specimens taken 

 from the bars of small cross section give higher results 

 than those from larger bars. 



