RESPECTING SOUND AND tlCKT. 



535 



in other experiments, its respective distances 

 were sometimes considerably less with the 

 same degrees of pressure. It may be in- 

 ferred, from the numbers of Tables vii and 

 VIII, that in several instances a greater 

 height of the first gage produced a less height 

 of the second : this arose from the nearer 

 approach of the apex of the cone to the ori- 

 fice of the tube, the stream losing a greater 

 portion of its velocity by this divergence 

 than it gained by the increase of pressure. 

 At first sight, tlie form of the current bears 

 some resemblance to the vena contracta of a 

 jet of w-dter : but Venturi has observed, that 

 in water an increase of pressure increases, 

 instead of diminishing, the distance of the 

 contracted section from the orifice. 



Table T. 



Table ti. 



The diameter of the tube .07. A is the 

 distance of the liquid from the orifice. B, 

 the pressure. C, the diameter of the surface 

 of the liquid displaced. 



Diameter of the tube, .1. A, B, and C, aa 

 in Table v. 



Table VII. 



Diameter of the tube .06". 



A is the distance of the opposite aperture, 

 from the orifice of the tube. B, the diameter 

 ofthe aperture. C,thepressure,indicated by the 

 first gage. D, the height ofthe second gage. 



