ON THE FLOW OF WATER IN PIPES, CONDUITS, ETC. 



141 



an analysis of the class differentiating into sub-classes and also a generaliza- 

 tion outside of this class. Some investigators and writers prefer to use the 

 coefficient of velocity c, (24), while others use the coefficient m. While 

 to some extent this is a matter of choice and convenience it should be 

 remembered that they vary inversely and that large variations in the one 

 correspond to small variations in the other. To facilitate the computations 

 and comparison of results Table I giving c in terms of m has been computed 

 from (35). It should be remembered that if 



1.5 



is not so small as to be negligible compared with m then the tabulated 

 value of m must be diminished by this amount. 



TABLE I. 



