328 Mr. Take Sone on the Magnetic Susceptibilities 



gas thus obtained was free from any trace of the nitric oxide 

 which is more or less present in the nitrogen gas obtained 

 by most of the other methods, and the removal of which was 

 very difficult. 



A solution of ammonium chloride and potassium nitrite 

 was gently heated in a flask on a water bath. After all the 

 air in the flask had been expelled, the gas generator was 

 connected with a large glass reservoir and then the gas 

 collected in it. Before introducing the o-as into the com- 

 pressing cylinder, the gas in the reservoir was passed 

 successively through a red-heated copper gauze, bottles 

 containing a solution of ferrous sulphate cooled with ice, 

 strong sulphuric acid, and tubes containing soda lime, calcium 

 chloride, phosphorus pentoxide, and calcium chloride. 



The ends of the tubes and of the bottles were brought so 

 closely together that the rubber tubes connecting them were 

 exposed to the gas as little as possible, and all the connecting- 

 parts were covered with collodion films. 



The following table contains an example of the data 

 obtained in' the magnetic measurement: — 







Table 



VIII. 







Dec. 26, 1916. 











N 2 



{p=25 atm.; 



) 





Vacuum. 





2 h 45 m p.m. 



, *=16°-7CL 



b=20-0, 



3 h 25* 



p.m., rf=18°- 



0C, ft =20-0, 



m Ao -f™ o =91-4086c 



igin. 



<m . 



=91-31585 gm. 



C. 



S. 



3. 



C. 



S. 



0. 



amp. 



cm. 



cm. 



amp. 



cm. 



cm. 







62-80 



-5-90 







49-90 



-4-50 



10 



56-90 



-5-90 



10 



45-40 



-3-80 







62-80 



-5-90 







49-20 



-4-45 



10 



56-90 



-5-80 



10 



44-75 



-3-85 







62-70 



-5-88;(raean) 



48-60 



— 4-15 (mean) 



Air Q> = 12 atin.) 





Calculation. 



4 h 33 m p.m. 



,t=19°-bC, 



6=200. 



d N»~ 



: -5-88+4-15= -1-73 cm.. 



■m a +w =91-3748 g 



in. 



d = 

 a 



:98-00 4-4-15 



= 102-15 cm., 



C. 



S. 



c. 



m N = 



=0-09278 gm. 



, »& a =0-0590gm. 



amp. 

 



cm. 

 2-20 



cm. 

 9800 



X N 2 = 



-1-73K 

 ' 0-09278 



- 18-65 K, 



10 

 



100-20 

 1-60 



98-60 

 96-90 



X a = 



102-22 K _ 

 ' 00590 



1732 K, 



10 

 



98-50 



o-oo 



98-50 ^ _ 

 98-00 (meau) % a 



-18-65 

 " 1732 



-0-0108. 



Three sets of such measurements gave as the specific 

 susceptibilities of nitrogen gas at a mean temperature 18° C, 

 10 G .x^==-°' 258 > -0-272, and -0*265, 



