112 



DR. B. D. STEELE, DR. D. McINTOSH AND DR. E. H. ARCHIBALD 



RAMSAY and SHIELDS. The tubeg, which enclosed a piece of soft iron, i, was selected 

 so as to slide easily and smoothly in a. It was held in position by the two glass 

 hooks e and /, which were placed so that when / was resting on e the bottom of the 

 capillary was a few millimetres below the scale. 



TO PUMP 



Fig. 5. 



A mark had been previously etched on the capillary, and when making the 

 measurements the position of the tube g was adjusted by means of an electro-magnet, 

 so that this mark always coincided with the meniscus inside the capillary. The 

 radius of the capillary near the etched mark was determined by introducing a 

 quantity of pure ether into the apparatus, and measuring the height of the column of 

 liquid when the capillary was in different positions. The radius could then be 

 calculated from KAMSAY and SHIELDS' values for the surface energy of ether. The 

 following values were found : 



