532 



HYDRODYNAMICS. 



Motion of 



Water in 



Pipes and 



Canals. 



From which it appears that the velocity is directly in 

 the compound ratio of the square roots of the diameter 

 of the pipe and the head of water, and inversely as the 

 square roots of the length of the pipe ; a result which 

 agrees with that which the Abbe Bossut obtained from 

 his experiments ; that is, for any given head of water 

 and diameter of pipe, the velocity in a horizontal pipe 



is inversely as the square root of the length of the pipe. Motion of 

 See page 511, col. 1. 



In Table IV. we have given the observed measures 

 in French inches, for the sake of those who may wish 

 to compare them with the other experiments of Du Bu- 

 at or Bossut. 



Pipes and- 

 Canals. 



TABLE III. 



Comparison ofProny's Formula, with the Results of Fifty-one Experiments by different Observers.. 



