MR. BEVAN ON THE MODULUS OF TORSION. 

 Talbe of the modulus of torsion of Metals. , 



Iron, English (wrought) 



Iron, English (wrought) 



Iron, thin hooping 



Steel . . . 



Steel . . . 



Steel . . . 



Iron cylinder 



Iron cylinder 



Iron square . 



Iron square . 



Iron square . 



Mean of Iron and Steel 



Iron, Cast 

 Iron, Cast 

 Iron, Cast 



Mean of cast-iron 

 Bell-metal . . . 



Specific 

 gravity. 



7.163 

 8.531 



Modulus of 

 Torsion. 

 Founds. 



1810000 

 1740000 

 1916000 

 1984000 

 1648000 

 1618000 

 1910000 

 1700000 

 1617000 

 1667000 

 1951000 



1779090 



940000 

 963000 

 952000 



951600 



818000 



131 



(I- 



On comparing these numbers with the modulus of elasticity of the same 

 substance, I find the modulus of torsion to be xVth of the modulus of elasticity 

 in metallic substances. 



'I t 



S2 



