65 
1908 - 9 .] On the Recalescence Temperatures of Nickel. 
in these curves. The explanation of the form of these curves is the same 
as in the case of fig. 3 b. 
The insulation of the thermo-couple wires was also changed to asbestos, 
but this also had no effect on the exhibition of recalescence. 
The results recorded by different workers on the transition tempera- 
tures of nickel differ somewhat, probably due to the fact that the specimens 
used were different in composition. Harrison * using the same specimen of 
nickel throughout, correlates the changes which occur in the magnetic, 
thermo-electric, and electrical resistance properties, the results being : — 
Range of temperature extending from sudden drop in magnetic 
permeability to its vanishing-point : 
320°-374° ' 
300°-373° ■ 
310°-374° 
according to previous 
thermal treatment. 
Range in which Peltier coefficient undergoes change, 290°-375°. 
Range in which change in slope of the resistance-temperature curve 
occurs, 320°-375°. 
* 
VOL. XXIX. 
* Phil Mag. (6) 8, 179, 1904. 
5 
