the 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



Q) J [SIXTH SERIES.] 



— . JUN1/ 1901 



JUNE 1901. 



LX. TAe Magnetic Properties of the Alloys of Cast-InffPfflii 

 Aluminium. — Part II. By S. W. Richardson, D.Sc, 

 Principal and Professor of Physics at the Hartley College, 

 Southampton, and Louis Lownds, B.Sc, 1851 Exhibition 

 Research Scholar, University College, Nottingham*. 



[Plate VI.] 



Contents. 



Page 



§ I. Introduction 601 



§ II. The Magnetic Measurements 603 



$ II L The Measurement of Temperature 606 



$ IV. The Heating Circuit 607 



§ V. Connexion between Hysteresis Loss and Temperature 60S 

 § VI. Changes in the Magnetic Properties produced by 



repeated Heatings 6i5 



§ VII. Experiments near the Temperature of Minimum 



Permeability 620 



§ VIII. Connexion between Temperature of Minimum Per- 

 meability and Percentage of Aluminium 623 



§ IX. The Microstructure of the Alloys 621 



§ I. Introduction. 



AN account of a series of experiments performed by one of 

 us on the magnetic properties of certain impure alloys 

 of iron and aluminium is given in the Philosophical Magazine 

 for January 1900. As the results obtained from these experi- 

 ments were of a very interesting character, the authors 



* Communicated by the Physical Society : read June 8, 1900. 

 Phil. Mag. S. 6. Vol. 1. No, 6. June 1901. 2 R 



