828 Proceedings of the Asiatic Society. [Dec, 



XIV. — Postscript to the Memoir on the Depression of the Wet-bulb 

 Thermometer, published in the July number. By Jas.Prinsep, Sec. fyc. 



I have only found leisure to repeat the experiments forming the 

 final section of my former paper, on one more of the simple gases, 

 namely oxygen ; of which the specific heat, calculated from the data 

 thus supplied, has not been found to differ materially from that of 

 common atmospherical air. It follows necessarily, that azote must 

 have the same specific heat, since the mixture of the two causes no 

 alteration in the observed depression. The experiments were con- 

 ducted in the same order as before, except that the glass exit tube 

 was somewhat narrower, and the dry thermometer was fixed in it half 

 an inch below the wetted bulb. Some trials, with common air, were 

 first made to ascertain whether this arrangement produced any material 

 difference of result. 



Depressions with Oxygen gas. 



Sept. 21 Common air, 

 Oct. 2 Ditto, 



4 Ditto, 

 11 Oxygen, 

 21 Ditto, 



Nov. 3 Ditto, 



5 Ditto, 



In the first experiment it is evident, that the hair hygrometer had 

 not reached its full contraction for the actual siccity of the air enclos- 

 ed in the gasometer. The trifling inferiority in the depressions for 

 oxygen, I am inclined to attribute to the more sparing hand with 

 which it was expended : — the difference of four per cent, is certainly 

 larger than ought to be conceded to experimental error, but I feel 

 sure that a more careful and longer series would have brought out a 

 nearer approach to the depressions observed in common air. 



Bar. 



t 



V 



d 



h 



Max. dep. 



Tabular 













a 





for 



hyg-o 



max. dep 



29.65 



92.0 



55.0 



36.8 



6? 





39.0 



37.2 



29.78 



83.8 



51.6 



32.4 









32.4 



32.7 



29.75 



89.5 



54.3 



35.2 









35,2 



35,7 



29.81 



82.0 



51.4 



30.6 



2 





31.2 



31.8 



30.00 



81.2 



53.4 



27.8 



2 ? 





28.3 



31.4 



29.90 



82.3 



52.1 



30.7 









30.7 



32.1 



29.88 



83.4 



52.2 



31.2 









31.2 



32.5 



XV. — Proceedings of the Asiatic Society. 



Wednesday Evening, the 4th January, 1837. 



The Honorable Sir Edward Ryan, President, in the chair. 



Messrs, W. Dent and M. Manuk, proposed at the last meeting, were 

 ballotted for, and duly elected Members of the Society. 



Captain Edward Sanders was proposed by Major Taylor, seconded 

 by Mr. W. H. Macnaghten, 



