61 
Fur the present argument it is sufficient to notice that 
A has a minimum value when p = '527pi. Since this fact 
determines the pressure at the orifice when the pressure in 
the receiving vessel is less than •527pi being the pressure 
in the discharging vessel. 
5o If instead of an orifice in a thin plate, the fiuid escaped 
through a pipe which gradually contracted to a nozzle. 
