668 
Proceedings of the Royal Society of Edinburgh. [Sess. 
this cycle, it was found that the cyclically steady state had been reached. 
On allowing the wire to cool to the temperature of the room, the modulus 
was higher than at the beginning of these two cycles, but it was lower than 
at the corresponding stage at the end of the first experiment. 
The wire was next loaded with 22 kilos, that is, 29 kilos per sq. nun., 
with the results shown in the graph. 
Finally, the wire was heated in the ordinary way, and the results of this 
experiment are also recorded in the graph. 
With the platinum, as with the other three wires, the value with the 
ordinary heating was higher than when it was heated by the current with 
the greater load on. When produced, the lines intersect at about 240° C. ; 
and again, from the slope of the curve, with the electric heating and smaller 
weight, we see that the graphs will all ultimately intersect. It is again 
possible also to suppose that all the three may finally coincide, and there be 
at last only one value for the modulus. 
[Table 
