60 MR. H. TOMLINSON ON THE INFLUENCE OF STRESS 
Table V.—Curves showing the temporary alteration of electrical conductivity of 
nickel wire produced by longitudinal traction at the temperature 22° C. 
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Remarks on Tables IV. and V. 
One of the first points to notice in Table IV. is the large value of “ Young's 
modulus,” which for both the hard drawn and the annealed conditions of the nickel 
exceeds the highest values obtained for pianoforte steel wire. 
Again we have seen in Part I. that the value of “ Young’s modulus ” increases as the 
mean distance between the molecules diminishes, and the ratio of the specific gravity 
to the atomic weight of nickel, which is inversely as the cube root of the mean 
distance between one molecule and another, is Y493, whilst that of iron, which with 
copper has the ratio higher than is the case with any of the other metals mentioned in 
this paper, is '1386. We have also seen that eXa' is roughly a constant for the 
different metals, where a is the mean distance between one molecule and another, and 
e is the value of £t Young’s modulus ; ” in the cases of nickel and iron this product is 
T838 X 10 12 and T993 X 10 12 respectively. 
The ratio of the lateral contraction to the linear elongation obtained from the 
