436 . bfibttrge of Fluids [rfook VII. 



experiment in the preceding table, where it appears 

 that the quantity of water furnifhed is fix hundred and 

 twenty- eight cubic inches. M. Mariotte, who made 

 the fame experiment, found the quantity to be a little 

 more ; but it is probable that he might commit a 

 fmall error, becatife the experiment I have juft cited 

 was made, M. 'Briflbn informs us, with the utmoft 

 care and attention. A (French) pint of water, he 

 adds, inftead of weighing two pounds, as is commonly 

 believed, is proved to fall fhort of that weight confi- 

 derably, as will be evident by ftrictly examining that 

 experiment. 



Thefe facts being premifed, I mall requeft the at- 

 tention of the reader, fecondly, to the difcharge of 

 fluids through additional pipes. 



When, inftead of caufmg water to pafs through an 

 aperture made in a thin fubftance, it is made to flow 

 through an additional vertical pipe of the fame dia- 

 meter with the orifice, the quantity of water dif- 

 charged is more confiderable, becaufe the contraction 

 of the ftream is greater in the firft cafe than in the 

 fecond. 



In the following experiments, the conftant height of 

 the water in the refervoir above the upper bafe of the 

 additional vertical pipe is 1 1 feet 8 44 inches (French) 

 and the diameter of the pipe one inch. 



