COEFFICIENT OF RESISTANCE. 169 



which in (4) gives for the loss of energy, or stored work 

 lost, 



0.052 |- W, or 5.2 per cent. (8) 



COR. 3. For efflux through a short cylindrical tube [Art. 

 95, (1)], we have <j> = .815, since < = ft, and therefore we 

 have, from (6), 



which in (4) gives, for the loss of energy, 



0.505 ~W, (9) 



or nearly 10 times as much as for efflux through an orifice 

 in a thin plate. 



SCH. Hence, if the kinetic energy of the water is to be 

 made use of, it is better to allow it to flow through an ori- 

 fice in a thin plate than through a short cylindrical tube. 

 But if the edge of the tube be rounded off where it is united 

 to the interior surface of the vessel, and shaped like the 

 contracted vein, we have ^ = = .975, and the loss of 

 energy is the same as it is for an orifice in a thin plate, *'. e., 

 5.2 per cent. 



COB. 4. From (6) we have 



which gives the coefficient of velocity in terms of the coef- 

 ficient of resistance. 



