STRENGTH OF STEEL. 



361 



gives a number of results of tests in tension and 

 shear, as well as many drifting tests. The following is 

 an abridgement of the chief results : 



OPEN-HEARTH STEEL FOR BOILERS. 



Tests of the same steel used in the earlier of the above 



'tests in shear gave the breaking stress in shear, when 



tested lengthways, as from 19'8 to 29'66 tons per square 



inch; and for plates cut crossways, 19'75 to 20'72 tons 



per square inch. 



These results give a ratio of ultimate shearing stress 

 to ultimate tensile stress of about 75 per cent. 



1 88. Strength of Tyre Steel. The following results 

 of tests by Mr. Arnold are given in his paper on 

 " Bessemer Steel Tyres " J : 



TESTS OF BESSEMER TYRE STEEL. 



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



