472 



Scientific Proceedings, Royal Dublin Society. 



the annealed part had a specific gravity of 7*77, and the untouched 

 part of 7*81. 



In Table VI. I have added the breaking strain in tons per 

 square inch of each of the test bars ; and it will be observed that 

 those specimens having a high breaking strain have a higher mag- 

 netic moment than the others. In the accompanying diagram 



0.15 

 .14 

 .13 



.12 



o 



£ 

 £ 



<« 



M .10 



s_ 

 o 



".09 



+• 



c 



<D 



| .Of 



£ 

 « .07 



« .06 



10 15 20 25 30 35 40 45 50 55 

 Tenacity in Tons per sq. inch. 

 Fig. 3. 



65 70 



(Fig. 3) the magnetic moment of the different specimens is plotted 

 against their breaking strain. The diagram shows that some such 

 relationship exists, though the number of experiments are too few 

 to found upon them any definite conclusion. It will be seen that 

 6 A is the only specimen that does not fall within the curve. I 

 hope before long to have a larger collection of rods of different 



