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Proceedings of the Royal Society of Edinburgh. [Sess. 
is attained during the process of cooling; but the resultant effect of the 
complete temperature cycle is to produce a great deterioration in the 
magnetic quality of the material. 
Fig. 5. 
A series of such successive heatings and coolings carried out with each 
of the alloys D and E resulted in a gradual, but lessening, deterioration 
in quality. It was not found possible to restore the quality to such a 
marked degree as effected by Mr B. Y. Hill in the case of an alloy having 
