512 



HYDRODYNAMICS. 



Motion of 

 Water in 

 Pipes and 



TABLE IV. ConteiwiHg the results of the Experiments of Couplet and Bossut on Conduit Pipes differing in form, 

 length, diameter, and in the materials of which they are composed, under different Altitudes of water in the Re~ 



Motion of 



Water in 



Pipes and 



Canals. 



servor. 



The application of the preceding Table is very sim- 

 ple. Let it be required, for example, to find the dia- 

 meter of a pipe capable of discharging 40,000 cubic 

 inches of water in a minute, at a point four feet be- 

 low the level of the spring, and by a pipe 2400 feet 

 long. Now, a short cylindrical tube, one inch in dia- 

 meter, will furnish 7070 cubic inches in a minute, 

 when the head of water is four feet. Hence, to find 

 the diameter which will discharge 40,000 cubic inches, 

 we have the analogy ^70720:^/40,000=12 lines: 

 28.54 lines, the diameter required. But it appears from 

 the preceding Table, that when the length of the pipe 



is about 2400 feet, it will discharge only about one- 

 eighth of the water, or 5000 cubic inches. Hence, in 

 order that it may discharge the whole 40,000 cubic 

 inches, its diameter must be increased. This new dia- 

 meter will be found thus, ^5000 : v/40,000= 28.54 

 lines to 80.72, or 6 inches 8^ lines, the diameter of 

 the pipe which will discharge 40,000 cubic inches of 

 water in a minute. 



The following Table contains the remaining experio 

 ments made by M. Bossut, 



