﻿Air &C,/or Pare Notes of different Pitch, 



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Tuning-fork. 



Tubes 

 I. and II. 



Tubes 

 I. and 111. 



Tubes 

 II. and III. 



Mean. 







metre. 

 3303 



330-3 



3301 



330-7 



3303 



metre. 

 330-G 



3306 



3305 



330-7 



330-5 



metre. 

 331-1 



330-9 



330-9 



330-6 



3306 



metre. 

 330-67 



330-60 



330-50 



330-67 



33047 



c 



a 



c 



0,n 



Mean 



330-582 



If this be the true velocity of sound in the open, then the 

 values of {a—v)'2r taken vertically in the first of the following 

 tables, and those of (a—v) V n taken horizontally in the 

 second ; should, as required by Kirchhoff's formula, be constant. 



Table L 

 Values of (a— v)2r. 



Internal 



diameter 



of the 



tube. 



c 4 . 

 »=256. 



»=320. 



$4- 



»=384. 



»=512. 



52 = 102325. 



millim. 



28 



0-09843 



0-0S626 



0-08093 



0-0G301 



005321 



171 



9825 



8618 



7780 



<>G34 



4753 



9-35 



9807 



8778 



8132 



6527 



4945 



Table II. 

 Values of {a — v) */n. 



Internal 



diameter 



c r 



e r 



9,- 



c tl . 



c 4ll . 



of the 

 tube. 



7i=256. 



»=320. 



»=384. 



w = 512. 



n=1023-26. 



millim. 

 28 



52-<34 



55-09 



56<')2 



50-91 



60-77 



171 



85-43 



9014 



8915 



87-78 



8890 



9-35 



159-7 



1080 



170-4 



1580 



109-2 



