S66 



H. XAGAOKA AND K. HOXDA 



\ natural size. 



of ;i similar result by the application of hydrostatic pressure, :is in the 

 experiments of Wassumth. No such marked influence of compres- 

 sion "was however observed, but a feeble change in the reading- of the 

 magnetometer showed that the effect was not immeasurably small. 

 It was only by special arrangement that the nature of the change 

 -could be clearly made out. 



The hydrostatic pressure was given by 

 means of Cailletet's pump for liquefying 

 gases. The pump was provided with 

 Ducretet manometer indicating pressures 

 up to 300 atmospheres. These indications 

 on being gauged by measuring the volume 

 of dry air gave wide ditferences from the 

 actual pressure, the relation between volume 

 and pressure being taken from Xatterer 

 and Amagat's results. One end of a seam- 

 less copper tube (length 4.7 m., internal 

 diameter 3 mm., and external diameter 

 7 mm.) was attached to the pump ; by 

 pumping in water into the tube, pressure 

 was communicated to a vessel containing 

 the iron or nickel which is to be compressserl. 



'1 he ovoid or rod, which was tobe 

 examined under different pressures, was 

 enclosed in a stout brass tube T (internal 

 diameter 1.1 cm., external diameter 2.0 

 cm., length 31 cm.) filled with water. The 

 Fig. 2. tube fitted loosely in the magnetizing 



I). Wassumtb, loc. cit. 



