1908-9.] Low Temperature Experiments in Magnetism. 
289 
Results for Steel Wire Specimen. 
Specimen as Received. — The results obtained on testing the specimen in 
this condition are exhibited in fig. 1. After being magnetised at room tem- 
perature the effect of the first cooling was to bring about a diminution in 
its magnetic moment of 45 per cent. On warming it to room temperature 
the magnetic moment still further diminished by about 11 per cent. On 
cooling the specimen once more the magnetic moment increased by about 
9 per cent., after which stage the effect of the cooling always resulted in 
an increase in the magnetic moment of about this amount. 
In the figures the firm lines give the magnetic moments of the speci- 
i 
Steel Wire fas supplied) 
Fig. 1. 
mens at room temperatures, and the dotted lines the magnetic moments at 
-190° C. 
Starting with the specimen magnetised when at —190° C., the effect of 
the first warming was to bring about a diminution in the magnetic moment 
of about 44 per cent. After this stage had been reached, cooling to — 190° C. 
caused an increase in the magnetic moment of nearly 125 per cent. 
Specimen in Annealed Condition. — (1) Magnetised at room tempera- 
ture. — The effect of the first cooling was to reduce the magnetic moment by 
about 40 per cent. On warming to room temperature the magnetic moment 
further diminised by 20 per cent., after which stage the effect of cooling the 
specimen was to increase the moment by about 5 per cent. 
(2) Specimen magnetised at — 190° C. — The effect of the first warming 
was to diminish the magnetic moment by about 65 per cent., after which 
VOL. xxix. 19 
