y(j DKNSITIKS UK OXYGEN AND HYDKOGEN 



Renewed joint : 



liint; 21 Exhausted 29.8270 



■ " . 28 Filled 2.0727 



30 " 20720 



I uly 4 Exhausted 29.8253 



Renewed lubrication : 



November 11 Exhausted 29.7385 



,2 Filled '-9855 



22 " 1-9778 



C!ounterpoise changed : 



December i Filled i .6434 



" 12 Exhausted 29.3924 



31. OXYGEN BY SECOND METHOD. KEDUCl'lON OF OJ5SEKVATION8. 



Tlie weislits of the oxygen found to have the same pressure as the standaid 

 volume of hydrogen when at the same temperature need a cori-ectinn for the differ- 

 ence between the coefficients of expansion of hydi-ogen and of oxygen. If these 

 coefficients were the same, the equality of pressure obsei-ved at ordinary tem- 

 peratures would also be preserved at the temperature of melting ice. Since the 

 expansion of oxygen is greater than that of hydrogen, the mass x)i the oxygen 

 recpiired at 0° will be greater than that at ordinary temperatures. If we assume 

 for the coefficients of expansion at constant volume the values .00;^(i()l and .U().'?674, 

 we mav apply the correction t'oi- tlie mean temperature of the whole series of ex- 

 periments, which was V.\Jf C. The foriniil.i for reduction therefore becomes: 



w 760 L I + 13.5 X .003674 0.45 



V 736.49 1, I + 13-5 X .003661 g 

 l.v which are obtained the vahies given in the following table. 



32. OXVtiEN 15V SECOND JlETllOU. UESILTS. 



The following table gives the weights of oxygen contained in the globes in the 

 given conditions, with the weights deduced for one litre of oxygen at normal tem- 

 perature and i>ressure at the sea level in latitude 45°. 



OUSERVATIONS WITH GLOBE 5. 



Weight of Density of 



NiimLcr. oxygen : oxygen : 



grammes. grammes. 



, 29.8457 1.42952 



2 29.8347 1.42900 



, 29.8267 1.42863 



\ ..'..'....... 29.825 1 1.42853 



c 29.8260 1.42858 



(,...... 29.8292 1.42873 



7 29.8376 142913 



8 29.8358 1.42905 



9 29.8340 1.42896 



