I8 ME. CLIVE CUTHBERTSON AND MAUDE CUTHBERTSON ON THE 



The ftfewbg are the details of a typical experiment by this method, in which the 

 refractivit y of the deozonised gas was separately determined :- 



Part I Refractivity of the ozonised oxygen- 



Bands (A = 54607) 489-9. Length of tube 99786 cm. Pressure difference 

 742-2 mm. (corrected). Temperature 16'25 C. 



^T9xJU fi0 ' 7 x 289-25 x 760 x 1Q-" _ . 00029 09. 



99786 x 273 x 742'2 



Part II. Refractivity of the deozonised oxygen- 



Bands 474-2. Pressure difference 764'33 mm. Temperature 14 7 C. ; whence 

 M _l = '00027193. 



Part III. Percentage of ozone 



V, = 764-33x289-25 = ro95 

 V, " 742-2x2877 



Thus percentage of ozone = 3'54 x 2 = 7"08. 



Part IV. Refractivity of pure ozone 



The refractivity of the mixture is the sum of the refractivities of its components. 

 Let /KO, 1 denote that of pure ozone, then 



7*08 xta-l) + 92-92 x '00027193 = 100 x "0002909, 

 whence ^,-1 - '000539. 



By this method the following results were obtained : 



TABLE IX. Refractivity of pure Ozone. (First Method.) 



