292 Proceedings of the Royal Society of Edinburgh. [Sess. 
after this time the effect of cooling the specimen to —190° C. was to bring 
about an increase in the magnetic moment of about 9 per cent. 
Special Hard Steel (Annealed) 
Fig. 5. 
Starting with the specimen magnetised when at the temperature of 
liquid air, the initial magnetic moment was 590 C.G.S. units. On warming 
i 
i 
i 
Special Hard Steel (Quenched) 
Fig. 6. 
to room temperature, the magnetic moment fell to 387 C.G.S. units ; and the 
effect of cooling once more to — 190° C. was to bring about an increase in 
the magnetic moment of about 13 per cent. 
The specimen was now remagnetised at room temperature, and the 
