548 Messrs. K. Honda and S. Shimizu on 



sponding value for the polonium rays 3*50 x 10 5 , which is 

 somewhat larger than the value 3*30 x 10 5 found ahove. 



The determination of the electrostatic deflexion of these 

 rays is now in progress, and will be completed by my former 

 colleague, Dr. W. B. Huff, to whom I wish to return thanks 

 for assistance kindly given in taking the observations in the 

 electrostatic experiments with radium. 



These experiments were carried on at the Cavendish 

 Laboratory under the guidance of Prof. J. J. Thomson, and 

 I wish in conclusion to thank him for the privilege of working 

 at the laboratory, and for his continued kindness and 

 suggestions during the progress of the work. 



Cavendish Laboratory, 

 July 31st, 1905. 



LXII. On the Magnetization and the Magnetic Change of 

 Length in Ferromagnetic Metals and Alloys at Temperatures 

 ranging from -186° C. to + 1200° C. By K. Honda, 

 Pigakuhakushi, Lecturer in Physics, Tokyo University, and 

 S. Shimizu, Pigakushi, Lecturer in Physics, High Normal 

 School*. 



[Plates IX. -XII.] 



IN the Journal of the College of Science of Tokyo Imperial 

 University (vol. xix.art. 11, 1903), Professor H. Nagaoka 

 and one of us published the results of experiments on the 

 magnetization and magnetostriction of nickel-steels contain- 

 ing different percentages of nickel. The present experiments 

 were undertaken, on the one hand, to extend the above in- 

 vestigation to different temperatures, and, on the other hand, 

 to form a continuation of our former experiments*". 



The experiments were made in three separate stages. In 

 the first series of experiments, which extended from Feb- 

 ruary 21 to July 2, 1903, the magnetization and the magnetic 

 changes of length at ordinary and liquid air temperatures 

 were measured ; in the second series, extending from 

 January 17 to February 2, 1904, the same measurements 

 were extended so as to include different intermediate tempe- 

 ratures between the ordinary and liquid air temperatures ; 

 lastly, in the third series of experiments, which extended 

 from March 10 to May 17, 1904, the magnetizations at high 

 temperatures were measured. 



* Communicated by the Authors. 



t K. Honda and S. Shimizu, Phil. Mag. vol. vi. p. 392 (1903). 



