388 Drs. M. W. Travers and C. J. Fox. [Junr '2 . 



Vapour Pressures of JLiquid Oxygen on the Hydrogen Scale. 



Pressure on gas in thermometer 286-55 mm. 286-65 mm. 



Temperature of dead space 16-5 C. 16*6 C. 



Temperature of stem 126*0 126*0 



Vapour pressure of oxygen 235'4 mm. 236*5 mm.. 



Temperature 



On new thermometer 80*27 80*30 



From previous measurements 80*26 80 -29 



Preparation of the oxygen. The oxygen employed was obtained by 

 heating pure potassium permanganate contained in a glass tube, 

 connected with the thermometer through a tube containing soda lime 

 and a glass spiral, which could be immersed in liquid air; all the 

 junctions were made by sealing together the various glass tubes in the 

 blowpipe flame. The thermometer was first exhausted ; oxygen was; 

 generated from the potassium permanganate, and allowed to liquefy 

 in the glass spiral, and then to enter the thermometer. The latter 

 was thoroughly washed out with the gas before it was finally filled. 



Vapour Pressures of Liquid Oxygen on the Constant- folume Oxygen Scale, 

 L Ice Point. December 10, 1902. 



Pressure on gas 658*55 mm. 



Temperature of dead space .. 15 -2 C. 



Pressure coefficient 0-0036738 



Constant 59-993 



Vapour Pressures of Liquid Oxygen. 

 December 12. 



Pressure on gas in thermometer 203-7 mm. 204-6 mm. 205*3 mm. 



Temperature of dead space 15-9 C. 15*7 C. 15-2 C, 



Temperature of stem 115'5 124 -0 130*0 



Vapour pressure of oxygen 369*9 mm. 382*9 mm. 394*8 mm, 



Temperature on oxygen scale ... 82-62 H3*10 83-37 



Deviation from helium scale l'21 1-02 1*01 



December 15. 



Pressure on gas in thermometer 208*8 mm. 209*3 mm, 209*7 mm. 



Temperature of dead space 1 7'4 C. 1 7*3 C. 17 *5 C. 



Temperature of stem 110 '0 112*0 113*0 



Vapour pressure of oxygen 477*8 mm. 488*1 mm. 498*2 mm. 



Temperature on oxygen scale... 84*88 85*04 8*15 



Deviation from helium scale , 1 0< 10 r-14 1'19 



