190 



Prof. Osborne Reynolds 



For the present argument it is sufficient to notice that 

 A has a minimum value when jt? = , 527p 1 ; since this fact 

 determines the pressure at the orifice when the pressure in the 

 receiving vessel is less than '527p 1 , that being the pressure in 

 the discharging vessel. 



5. If, instead of an orifice in a thin plate, the fluid escaped 

 through a pipe which gradually contracted to a nozle, then 



it would follow at once, from what has been already said, 



