326 Mr. Take Sone on the Magnetic Susceptibilities 



tube, 8 is the difference between these readings, and B m the 

 mean for each set of observations : — 









Table VI. 







May 28, 1917. 







C0 2 Q»=35 atm.) 





Vacuum. 







2=18°'5C., 6=10-0. 



b= 



:10-0, m - 



=98-7750 gm. 



m COo +m =99-0673 gm. 



c. 



r. 



8. 



*»■ 



C. 



r. 8. 



.»i- 



'.rap. 



cm. 



cm. 



cm. 



amp. 



cm. cm. 



cm. 







27-32 



-2-48 



-2;65 







29-00 -14-53 



-1473 



10 



29-80 



-2-82 





10 



43-53 -14-93 









26-98 











28-60 









26-76 



-2-34 



-2-52 







28-60 -14-55 



-14-35 



10 



29-10 



-2-70 





10 



43-15 -14-15 









26-40 











2900 









26-25 



-2-30 



-2-55 







29-35 —14-35 



-14-63 



10 

 



28-55 

 25-75 



-2-80 





10 







4370 -14-90 



28-80 







- 14-57(mean) 







25 ; 70 



-2-45 



-2-73 









10 

 



28-15 

 2515 



-300 











-2-61 (mean) 









Air. 







Calculation. 





*=18°-0C, 6=10-0, 



d 



COo = - 14-57+2-61 = -11-96 cm., 





m a +7n = 



=98-7795 



gm. 





d fl =7-02 + 2-61 = 



= 963 cm., 



c. 



r. 



8. 



*»■ 



m 



co =0-3223 gm., 



m =0-0045 gm., 



amp 



cm. 



cm. 



cm. 





2 







 10 



24-57 

 17-70 



6-87 

 7-05 



6-96 



Y -11-96 K 

 c °i~ 0-3223 



= -37-lK 







24-75 









9-63 K 01 



Y = =isJ 



"" 00045 



l40K, 



















24-75 



7-00 



7-08 



> 



'co 2 -37-1 





10 



17-75 



7-15 







Xa " 21 "° " 



0-0173. 













24 90 





7-02 (mean) 





The fact that the results of these different methods are 

 in close agreement with each other not only indicates that 

 the deflexion metbod is practically equivalent to the null- 

 method, but also that the intensity of the magnetic field 

 coming into play is constant, at least in the range in which 

 the measuring tube displaces itself by the magnetization. 



The deflexion method is, however, much simpler in 

 operation than the null-method, because the latter method 

 requires much time, and consequently many difficulties are 

 likely to occur during observation, such as those caused by 

 the convection current due to the heating of the electro- 

 magnet. Hence after it was ascertained that the deflexion 



