IV.— CHEMISTRY AND PHYSICS. 



Abt. LI. — A71 Instniment for roughly determining the Bela- 

 tive Thermometric Conductivities of Liquids. 



By Dr. W. P. Evans. 



[Read before the Philosophical Institute of Canterbury, 4th May, 1898,'] 



Two similar capsules of thin glass or metal are placed verti- 

 cally, one over the other, with the bulb of an open-air ther- 

 mometer between them. The two capsules and the bulb are 

 enclosed in a cylinder of considerably larger diameter, the 



1 b ^^ Co/</ Capsu/e 



capillary stem of the thermometer coming in a horizontal 

 direction through the cylinder wall. Through the upper 

 capsule the vapour of some boiling liquid, or, if more com 

 venient, warm water at constant temperature, is passed ; 



