C f i ap , 3 } through additional Pipes . 



437 



The variable heights of the 

 lube exprefTed in lines. 



Lines. 



Exper. I. - 



2. - 



3- - 

 4. - 



- 48 f T^ water 



J running 

 "^ J through a 



- I 8 (^ full pipe. 



{The water 

 not filling 

 the pipe. 



Number of cubic inches of 

 water difcharged in one 

 minute. 



- 12,274 



- 12,188 



- 12,168 



- 9,282 



It appears from this table of experiments, that the 

 longer the vertical pipe is, the greater will be the 

 quantity of water difcharged, becaufe the contraction 

 of the dream is lefs, as may be fecn by comparing the 

 three firft experiments. There is always, however, 

 fome contraction, though the water appears to flow 

 out of a full pipe. 



In comparing the quantities of water difcharged in 

 the third and fourth experiments, it will appear, that tlfC 

 two quantities, 12,168 cubic inches and 9,282 cubic 

 inches, are to each other nearly in the relation of 

 thirteen to ten ; but it has been obferved before, that 

 the quantity of water difcharged through an aperture 

 made in a thin fubftance, if the ftream was not 

 contracted, would be to the quantity of water dif- 

 charged through the fame orifice, if the ftream was 

 contracted, nearly as fixteen to ten. Hence then it 

 may be concluded, that the height of the water in the 

 refervoir and the different apertures being the fame, the 

 quantity of water difcharged through an orifice made 

 in a thin fubftance, in which there Was no contraction 

 of the ftream, -the quantity of water difcharged through 

 F f 3 an 



