Radiation of Heat by Gases and Vapours. 189 



By mercurial gauge. 



Deflection. Absorption. 



Tension, 



i inch 



48-5 



60 



1 inch 



56-5 



96 



Table X. — Iodide of Amyle. 



Unit- 



measure —th of a 



cubic inch 





Absorpti 



ton. 



Measures. 



Observed. 



Calculated. 



1 



0-6 



0-5/ 



2 



10 



11 



3 



1-4 



17 



4 



2-0 



2-3 



5 



3-0 



2-9 



6 



3-8 



3-4 



7 



4-5 



4-0 



'8 



5-0 



4-6 



9 



50 



5-1 



10 



5-8 



57 



The deflections here are very small ; the substance, however, 

 possesses so feeble a volatility, that the tension of a measure of 

 its vapour, when diffused through the experimental tube, must 

 be infinitesimal. With the specimen which I examined, it was 

 not practicable to obtain a tension sufficient to depress the mer- 

 hence no observations of this kind are 



recorded. 



Table XI.— Chloride of Amyle. 



Unit-measure T \jth of a cubic inch. 



Absorption. 



Measures. 



Observed. 



Calculated. 



1 



1-3 



1-3 



2 



3-0 



2-6 



3 



3-8 



39 



4 



5-1 



5-2 



5 



6-8 



65 



6 



8-5 



7-8 



7 



90 



91. 



8 



10-9 



10-4 



9 



11-3 



117 



10 



123 



130 



By mercurial gauge. 

 Tension. Deflection. Absorption. 



h inch 59 13/ 



1 inch not practicable. 



