﻿Air §c.for Pure Notes of different Pitch. 



259 



the following table, in which the values for carbonic acid are 

 referred to those for air as unity. 





Dulong * . 



Regnaukt. 



Wiillner {. 



Kuadt §. 



Low. 



Air 



C0 2 



1 

 0-7856 



1 

 0-8009 



1 

 0-7812 



1 



07785 



1 

 0-77750 



To test further the validity of KirchhofFs formula, I have, 

 as before, calculated the products (a — v)2r and (a — v) v/ n 

 for a = 257'03 metre. The results, taken vertically in the 

 first table and horizontally in the second ; should be constant. 



Table I. 

 Values of (a — v)2r. 



Tube. 



c r 



. e r 



ffr 



c lt . 



c ur 



I 



004620 



003640 



003273 



0-02745 



001848 



II 



4275 



3540 



3061 



2856 



2137 





4161 



3741 



3385 



3123 



2374 



Table II. 

 Values of (a — v) \^n. 



Tube. 



c r 



e,. 



ffr 



c„- 



c .ir 



I 



2640 



23-26 



22 93 



2217 



21-11 



II 



39-99 



3703 



3509 



3779 



3998 



Ill 



71-24 



7147 



7094 



75-56 



81-25 



Here, again, the deviations from a constant mean are quite 

 unimportant, and are evidently due to small errors of ob- 

 servation. 



* Ann. de Chirn. et de Phys. torn. x. p. 41. 

 t Regnault, see footnotes, p. 249. 

 X Lehrbuch der Pkysik, iv. Aufl. 1, p. 804. 

 § Kuiidt, see footnotes, p. 249. 



