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REMARKS on the VELOCITY with which FLUIDS ijfue from 

 APERTURES in the VESSELS which contain them. By the 

 Rev. MATTHEW YOUNG, D, D. S. F. T. C. D. & M. R. I A. 



W 



HEN water iffues from a fmall aperture in the bottom ^^^^ ,^ 

 or fide of a veffel, which is kept conftantly full, it has been 20th, 1798. 

 fuppofed, that the force accelerating the loweft plate of water, 

 of indefinitely little altitude, immediately over the orifice, is 

 the weight of the incumbent water only ; and therefore, that 

 after the motion of the plate has once commenced, the preflure 

 of the incumbent column will be diminifhed, and of confe- 

 quence, the force accelerating the plate, during its defcent 

 through its own altitude, will not be conftant. 



But, in fadt, it is not the prefTure of the incumbent water, 

 which accelerates the loweft plate ; for every plate of water 

 immediately incumbent over the hole, abflradling from all 

 lateral preflure, begins to be accelerated equally at the fame 

 moment ; and therefore the incumbent column, exclufive of 

 any lateral preffure, could produce no increafe of velocity, in 

 proportion to its increafed height. The force which really 



accelerates 



