AND STRAIN ON THE ACTION OF PHYSICAL FORCES. 
125 
Table XXIII.—Curves showing the temporary alteration of electrical conductivity 
of nickel produced by longitudinal traction at temperatures of 10° C., 13° C., and 
100° C. 
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Remarks on the last experiments and oil Table XXIII. 
Experiment XLV. teaches us that though the alteration of resistance of the iron 
when loaded with 3 kilogs. is greater at 13° C. before heating to 100° C. than at 100° C.; 
yet, after cooling again to 13° C., the alteration is very slightly less than it had been 
at 100° C., and, on the whole, there is a permanent decrease of the temporary alteration 
of resistance produced by the loading. From Experiment XLYI. we learn that the 
second heating to 100° C. still further increases the difference of the effect of loading 
with 3 kilogs. at the lower and the higher temperatures ; the alteration at the higher 
temperature being now more than 6'5 per cent, greater than at the lower temperature; 
hut when the load employed is only 1 kilog., the alteration seems to be greater at the 
lower temperature than at the higher. Experiment XLVII. shows that when the 
wire was treated with 6 kilogs. there was a permanent increase of elasticity produced 
by the loading, and it should at the same time be noted that 6 kilogs. when first put 
on the wire, barely produced a permanent increase of length —an increase certainly not 
amounting to more than y^-th per cent. By comparing also columns two and six we 
can see that the slight annealing caused by raising to 100° C., and cooling again has 
