Mi) 



2np 



Velocity of Sound in Air. 331 



(Lord Eayleigh. ' Theory of Sound,' § 347), 



so that 



As a slight deviation from accuracy in the relative values of 

 \/ - would affect the calculated values of V only to an 

 exceedingly small extent, we may put 



\/H> \Zi =i > \Zi^> Vi mi *> 



and \/~ =1-4 

 V n± 



in place of the values given in Table V. ; and introducing 

 these values into formulas (1) and (2), we get 



1*4 V 1*2 V 



= log— ; ■= — = log—, &c, &c, 



or 



log V= 101o g^-71og^ 



(3) 



From which 



V = 33K)89. 



In the same way values for V can be found from any two 

 values of v — as v and v 1? v and v 4 , &c, as follows : — 



Table VI. 

 fv 4 and v 3 = 331-089 



o 



.'- 



o 



a 



3 



O 



Mean 



v 2 = 332-150 

 v, = 331-620 

 v = 331-999 

 v 2 = 331-508 

 Wl = 331-881 

 v = 331-746 

 Vl = 331-540 

 v = 331-620 

 v = 331-603 



= 331-676 



As Vi and v 2 have practically the same values for n, V as 

 obtained from this pair of velocities is uninfluenced by the 



Z2 



