I Motion of 

 I 



HYDRODYNAMICS. 



TABLE V. Containing Bouni's Experiments on the Quantities of Water discharged by 

 different Pipe* of various Length* and nrith different Ajutaget. 



513 



Motion of 



Water in 



Pipes and 



Canals. 



The preceding experiments were made at Meiieres, on 

 the 8th and 9th October 1 779, upon the water dischar- 

 ged from the public and private fountains of that city. 



Bottuft Experiment! on the Pretttire exerted tpon Pipe* 

 by the Water nhich they convey. 



In Chap. I. of this part of hydraulics, we have al- 

 ready considered theoretically 'the amount of the pressure 

 exerted upon conduit pipes by the included water. 

 J When a tube placed horizontally discharges water with- 

 " out any additional aperture, it i* obviou* that the weight 

 of the included water is the principal force which it has 



to bear. But if the water is discharged through a small 

 ajutage, the velocity of the water in the pipe is dimi- 

 nished, and hence there results a pressure against the 

 sides. In order to measure this pressure, Bossut per- 

 forated the pipes at different lengths or distances Irom 

 the reservoir with small apertures exactly perptruli- 

 cular to the axis of the pipe, and considered the quan- 

 tity of water discharged in a given time, as the exact 

 measure of the lateral pressure which forced the fluid 

 through the orifice. In this way he obtained the result* 

 in the three first columns of the following Table, \vhii-h 

 is suited to an orifice 3* lines in diameter. 



TABLB VI. Containing the 



the Sides of Pip*. 



ky Later*/ Orifice, or the Preitura on 

 to Theory and Experiment. 



AfetadeofUM 

 WswrJBtne 



i SSI 



2 

 S 

 2 

 2 

 2 

 1 



(flbe 



Past, 



SO 



60 



90 



120 



150 



180 



60 



90 



180 



ISO 



180 



Cubic lodw. 

 171 

 186 

 190 

 191 

 1<JS 



2H) 



'..'.,1 

 264 

 ft 

 266 



Quantitks rf Water dk- 



1 TUitet ul 



<.ubic 1:., .,--. 



176 

 186 

 190 

 191 

 192 

 193 



M4 



259 

 264 



268 

 269 



VOL. xi. PART u. 



