of Heat by Gaseous and Liquid Matter. 



105 



Table L. — Dynamic radiation of Vapours. 



Deflection. 



By 1st chamber, 

 2nd chamber 



Bisulphide of carbon 

 Benzole . . 

 Chloroform . 

 Iodide of ethyle 

 Alcohol . . 

 Sulphuric ether 

 Formic ether . 

 Propionate of ethyle 

 Acetic ether . . 



empty. 



o 



8-2 

 20-0 

 24-3 

 27-5 

 42-7 

 46-3 

 47-5 

 49-8 

 53-3 



By 1st chamber, 



vapour in 2nd 



chamber. 



5-8 



12-4 

 10-9 

 14-7 

 22-3 

 21-7 

 19-8 

 25-0 

 300 



By 2nd 

 chamber. 



21-2 

 45-9 

 55-2 

 55-3 

 69-0 

 80-5 

 795 

 82-3 

 82-1 



To ascertain whether the absorption by the vapours bears any 

 significant relation to the absorption by the liquids from which 

 these vapours were derived, the transmission of radiant heat 

 through those liquids was examined. The open flame of an oil- 

 lamp was used, and the liquids were enclosed in rock-salt cells. 

 Thus the total radiation from the lamp, with the exception of 

 the minute fraction absorbed by the rock-salt, was brought to 

 bear upon the liquid. 



In the following Table the liquids are arranged in the order 

 of their powers of transmission. 



Table LI. 



Transmission in 

 Name of liquid. hundredths of 



the radiation. 



Bisulphide of carbon 83 



Bisulphide of carbon saturated with sulphur . . 82 

 Bisulphide of carbon saturated with iodine . . 81 



Bromine 77 



Chloroform ... 73 



Iodide of methyle . 69 



Benzole 60 



Iodide of ethyle 57 



Amylene 50 



Sulphuric ether 41 



Acetic ether 34 



Formic ether 33 



Alcohol 30 



Water saturated with rock-salt 26 



These results are but approximate, but they are not very far 



