M-2 



STIIKNGTH OF STEEL. 



The following figures were also obtained from specimens 

 of the same material, the bars having different measured 

 lengths : 



Comparative tests of unhardened and hardened speci- 

 mens of the same steel : 



In the discussion on the above paper, Mr. KirkaldyJ; 

 quoted the following results of tests on various grades of 

 tyre steel : 



KIRKALDY'S TESTS OF TYRE STEEL. 



189. The Strength of Gun Steel. The treatment and 

 strength of the steel used in the manufacture of ordnance 

 has been fully discussed in a paper by Col. Maitland, R.A. 

 The paper is accompanied by a large number of test 

 results, some of which are quoted below. The material 

 bearing the name of gun steel is a ductile metal having a 

 tensile strength of about 30 tons per square inch in its 



" The Treatment of Gun Steel," Min. Proc. Inst. C.E., vol. Ixxxix. 

 I From Min. Proc. Inst. C.E., vol. xcv. 



