166 M. V. Regnault on the Velocity of the 



The diminution of the mean velocity of one and the same 

 wave reckoned from its origin, but which is examined after tra- 

 versing longer and longer paths, is very marked. ^ q 



(2) Tube of diameter 0*33 metre (route militaire). 

 Distances traversed. Mean velocities, V . 



Charge of powder 0'4 grm. 

 metres. metres. 



1905.0 331-91 



3810-0 ..... 328-72 



Charge of powder 0*4 grm. 



1905-0 332-37 



3810-0 330-34 



Charge of powder 1*5 grm. 

 Reflexion on the closed end B. 



3810-3 332-18 



7620-6 330-43 



114300 329-64 



15240-0 328-96 



The mean velocities for waves produced by the same charge of 

 powder and for equal paths are accordingly much greater in a 

 tube of 0*30 than in one of 0*108 metre diameter. 



(1) Tube of diameter 1*10 metre (cgout St. Michel). 



Distances Mean 



traversed. Velocities, V' () . 



Charge of powder 1*0 grm. 



metres. metres. 



7191 .... 334-16 



920-1 .... 333-20 



1417-9 .... 332-50 



2835-8 .... 331-72 



5671-8 .... 330-24 



8507-7 .... 330-87 



11343-6 .... 330-68 



14179-5 .... 330-56 



17015-4 .... 330-50 



19851-3 .... 330-52 



The mean velocity of propagation in the tube of diameter 1*10 

 metre diminishes less quickly than that in the one of the dia- 

 meter 0'30. The first velocities are greater, because they are 

 taken much nearer to the origin of the wave. 



The differences are still more marked when we compare the 



