430 Profs. J. Dewar and J. A. Fleming. On tho 



FIG. 2. 



600,000 



700,000 



600,000 



Cnange of Rests /wty of 

 E/ecro/y/'c Bismuth when transverse/y 



magnetised. 



(n/arged sda/e). 



O- 2OOO- 4000- 6,OOO _ 8,OOO- ^ 



Strength of Transverse Magnet/'c f/'e/d m C.G.S. unite. 



remarkably the resistance is affected by such magnetisation. The* 

 curve of resistance taken in liquid air, shows that by a transverse 

 magnetising field having a strength of 22,000 C.G.S. units, the 

 resistance of the bismuth is made 150 times greater than the resist- 

 ance of the same wire in a zero field, but at the same temperature. 



The lower the temperature to which the bismuth is reduced the 

 greater is the multiplying power of a given transverse field upon its 

 electrical resistivity. 



Hence a still lower temperature than we have been able to apply 

 would doubtless render the bismuth still more sensitive to transverse 

 magnetisation. 



We have already shown that pure bismuth is no exception to the- 

 generally observed fact that all pure metals continuously lose their 

 electrical resistivity as they approach in temperature the absolute? 



