Cv.ap. 3.] Fountains. 445 



third column contains in (Paris) pints, of which thirty- 

 fix make a cubic foot, the quantities of water diP- 

 charged in one minute through an ajutage of half an 

 inch diameter, relatively to the heights in the fecond 

 column. The quantity difcharged through an ajutage 

 of half an inch diameter being known, the quantity 

 -which will be difcharged by any other ajutage, under 

 the fame height of the refervoir, may be found by 

 fingle proportion; for it has already been proved, 

 that the quantities of water difcharged are to each 

 other as the areas of the ajutages, or as the fquares of 

 their diameters. In the fourth column are found the 

 diameters for the conducting pipes of an ajutage of half 

 an inch diameter, according to the heights in the fe- 

 cond column. The diameters of pipes for other aju- 

 tages, and other heights of the refervoir, are found by 

 following the preceding rule. 



Fractions are not obferved in the calculations for 

 the two lad columns. 



