293 
1908-9.] Low Temperature Experiments in Magnetism. 
procedure repeated. It will be seen that the results obtained differ very 
greatly from those yielded by the freshly annealed specimen. The initial 
magnetic moment was now 557 C.G.S. units. On cooling the specimen to 
— 190° C. its magnetic moment diminished to 416 C.G.S. units. Warming to 
room temperature resulted in the magnetic moment still further diminish- 
ing to 406 C.G.S. units, and after this stage any subsequent cooling resulted 
in a small increase taking place in the magnetic moment. 
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Magnetised at Room Temperature 
Magnetised in Liquid Air 
Manganese Steel (6 Mn.) Annealed 
Fig. 7. 
Magnetised at Room Temperature after Cooling 
Quenching produces very little change in the properties of this steel, 
and for this reason the results obtained with the specimen after quenching 
are not included. 
The properties of this steel for low and moderate fields have been in- 
vestigated by A. D. Ross and one of the Authors. The results obtained 
will be communicated shortly to this Society. In the annealed condition 
the material is, comparatively speaking, feebly magnetic. Cooling to the 
temperature of liquid air results in the permeability being greatly in- 
creased, and on warming to room temperature a further large improvement 
in magnetic quality is brought about. 
