HYDRODYNAMIC S. 



-JO 3 



Li-.*! -ir.-r 

 of Wutt 



ihrouth 



The discharge in the preceding Table, for a simple 

 orifice, is less than that which is given by Bossut, 



which appears to arise from his having used a measure 

 of the cubic inch of water, which errs in excess. ' 



From 



Poleni's results, we may conclude, 



1. That the real discharges are always less with coni- 

 cal tubes than the theoretical discharges, which, in the 

 present case, u 27425 cubical inches in a minute ; 

 and, 



2. That in augmenting to a certain degree the dia- 

 meter of the inner orifice of the conical tube, the quan- 

 tity of water expended is also augmented ; but that, 

 when this enlargement is pushed too far, there is .1 ten- 

 dency to produce an exterior contraction of the vein 



of fluid, and thus to make the circumstances of the 

 case the same as in simple orifices, in which the dis- 

 charge* are the least possible. 



When the conical tube is placed with its smallest ori- 

 fice in the reservoir, it will yield more water than a 

 cylindrical tube, the diameter of whose orifice is equal 

 to the smallest orifice of the conical tube. 



The best experiments on additional tubes, have been 

 made by M. Venturi, and fully described in his valu- 

 able work on the lateral communication of motion in 

 fluids. We have thrown them, in an abridged state, 

 into the following Table, and have computed the num- 

 bers in the last column. 



Di! 



of Wter 



through 



additional 



Tuba. 



Eiperi- 

 uienls of 

 M. Venturi 

 on tubes of 

 various 

 forms. 



TABLE XII. Containing the Experiment* of Fenluri on additional Tubet of variant formt. 



ft 11. 



frl*. 



1,11. 



13. 



.It 



14. 



