118 
MR, H. TOMLINSON ON THE INFLUENCE OF STRESS 
superior change of resistance is - 
(' 0 x j> 
temperatures, which were about 100° C. and 20° C, 
A 5 l ' being the higher of the two 
Table XXII.—Curves showing the effect of permanent torsion on the temporary- 
alteration of electrical resistance produced by change of temperature. 
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Remarks on the last experiments and tables. 
The first point to be noticed is that the metals examined may be divided into two 
classes. In the first of these classes, which includes iron, zinc and platinum-silver,'" 
* In some experiments made by H. A. Taylor (see “ Report of Electrical Standards Commission,” 
Appendix II., Brit. Ass., York Meeting, 1881), the effect of drawing platinum-silver wire to finer and 
