564: Prof. Deivar on Properties of Liquid Oxygen. [Jan. 22, '97. 



Mr. Townsend for an aqueous solution of ferric chloride, and which 

 he states can be calculated by the equation 



10'k = 91-6m>- 0-77, 



where w is the weight of salt in grams per cubic centimetre, and Jc 

 the magnetic susceptibility. Even in a saturated solution, w cannot 

 exceed * 6, hence, from the above equation, we find the value of the 

 magnetic susceptibility of a saturated solution of one of the most para- 

 magnetic iron salts, viz. ferric chloride, is 54/10^ for magnetic forces 

 between 1 and 9. This agrees fairly well with other determinations 

 of the same constant. On the other hand, the magnetic suscepti- 

 bility of liquid oxygen for the same volume is 228/10^ or more than 

 four times as great. The unique position of liquid oxygen in respect 

 of its magnetic susceptibility is thus strikingly shown. It is, how- 

 ever, interesting to note that its permeability lies far below that of 

 certain solid iron alloys generally called non-magnetic. 



In the course of these investigations valuable assistance has been 

 given by Mr. Robert Lennox and Mr. J. W. Heath. 



I J. D.] 



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