Chap. 3.] through additional Pipes. 539 



remainder of the length of the pipe may be either 

 cylindrical or prifmatic. The difcharge will then be 

 equally abundant with that which would take place 

 through an aperture equal to the fmaller bafe made in 

 a thin partition, and in wliich the ftream fuffered no 

 contraction. This form may be applied to practice 

 whenever it is required to draw a certain quantity of 

 water from a river by an aqueduct, &c. through a 

 canal or lateral pipe. 



If we compare the different quantities of water 

 difchargcd through additional pipes of different dia- 

 meters with different altitudes of the water in the re- 

 fervoirs, we lhall have the refults dated in the following 

 table, the additional pipes being fuppofed to be two 

 inches long, and vertical, or placed in the bottom of 

 the refervoir. 



The firft inference from thefe experiments is, that 



the quantity of water difcharged by different additional 



pipes, under the fame height of water in the refervoir, 



Ff 4 is 



