84 



K. HONDA. 



So far as I am aware, Barrett^' is tlie only physicist who has 

 investigated tlie effect of temperature on the change of length ; 

 his experiment resulted in the decrease of about one-fourth of 

 the change of length by a rise of temperature by about 50° C. 

 Perhaps his field was too strong to cause an increase. 



8. The results of the change of length by longitudinal 

 magnetization with a constant circular field are given in the 

 following table and in Fig. 4. The change of length was re- 

 duced to the temperature of 18.8° C by using the results above 

 obtained. 



TABLE II. 



1} Barrett, Phil. Ma,^. [4] 47, 51, 1S74 ; Nature 2«, 515 58G, 1882; Beibl. 7, 201. 



