OXYGEN. 



31 



1.24297 

 1.24303 

 I.242S6 

 1. 24271 

 1.24283 

 1.24260 

 1. 243 1 4 

 1.24294 



Mean, 1.24289, dz .00004 



The weight of hydrogen evolved from one gramme of ahiniinum was 

 found in Thomsen's gravimetric research to be 0.11190, ±: .000015. 

 Hence the weight of one litre at 0°, 760 mm., and 10.6 meters above sea 

 level at Copenhagen is : 



.090032, zb .000012 ; 



or at sea level in latitude 45°, 



.0S9947, zh .000012 gramme. 



The data for oxygen are given in somewhat different form, namely, 

 for the volume of one gramme of the gas at 0°, 760, and at Copenhagen. 

 The values are, in litres : 



.69902 



.69923 



.69912 



.69917 



.69903 



.69900 



V .69901 



.69921 

 .69901 

 .69922 



Mean, 

 At sea level in latitude 45°, 



Hence one litre weigns 1.42906, 



69910, 

 69976, 



: .00002 

 .00002 



.00004 grammes. 



Dividing this by the weight found for hydrogen, 0.089947, ± .000012 

 we have for the ratio H : 0, 



15.8878, =b .0022. 



The density ratios, H : 0, now combine as follows : 



Dumas and Boussingault, corrected 15.9015, zh .031 



Regnault, corrected l5-9io5> =fc .0044 



Rayleigh, 1888 15.884, ±.0048 



" 1892 15.882, zir .0023 



Cooke '5.890, zh .0067 



Leduc 15-905, ±0154 



Morley, including all the data ., 15.8955, zb .0005 



Thomsen 15.8878, zfc .0022 



General mean 15.8948, zt .00048 



