34 ME. J. REGINALD ASHWORTH: 
bendiug the curves upwards rapidly. But the final drop in the modulus does not 
appear to have a counterpart here, unless the missing No. 12 diminishes in density. 
It is to be noticed that the percentage variation of Young’s modulus from one end 
of the curve to the other is about ten times the percentage variation of the density, 
and also the average temjjerature coefiicient of the modulus is about ten times the 
temperature coefficient of density, or cubical expansion, so that it is possible that much 
of the diminution of elasticity with rise of temperature may be due to thermal 
expansion diminishing the density. 
A more obvious correspondence exists between the curve of residual magnetic 
intensity (dimension ratio =100) and the curve of density, both rising continually 
and rapidly from the 5th point. The relationship is more easily traced when 
intensity is plotted against density, as in Diagram IX. Between the 5th and 9th 
Diagram IX. 
Y 
The relation of residual magnetic intensity and Youxg’s modulus to density in drawn steel. 
stages inclusive the ratio of the increment of magnetic moment per unit volume to 
the increment of mass per unit volume is nearly constantly 4100, or each molecule 
added per unit volume contributes directly or indirectly to the whole a magnetic 
moment 4100 times its mass. This is, however, a doubtful clue to even an inferior 
limit to the magnetic moment of a molecule, since it cannot be assumed that there is 
