162 A. TAXAKADATE AND H. NAGAOKA. 



Tlie magnet, however, showed a sudden decrease of moment at 

 Nagahamn. It is likely that the temperature coefficient after this fall 

 of moment \^^as different from that at Xagoya. By using the moments 

 found at Isshiki, the temperature coefficient was recalculated. For 

 reducing the results of the former survey, the temperature correction 

 was calculated from determinations of magnetic moment made at 

 Miyazaki. 



The following empirical formula was used in the calculation, 



ilf=il/, + m + a (/-^,) + /> (t-t,y 



where M^, is the mean of the moments used, m a small correction to 

 be applied to il/,,, /,, the mean temperature, iixid a, h the coefficients 

 to be determined. The above formula was then transformed, for 

 convenience of calculation, to 



where z is any convenient temperature. The following gives the 

 data and results of calculation from ol^servations made at Xagoya, 

 Isshiki, and Miyazaki : — 



Nagoija. 



Magnetic Moment. Temperature. 



whence il/=674.3111-.00083(«- 10") + . 0000068(^-107 



