a pair of orifice plates, each said plate being disposed in {HEAD ~ a respective flow system} between {TAIL ~ said clamping device} and said reservoir to create a measurable pressure drop in a fluid passing therethrough 
a pair of orifice plates , each said plate being disposed in { HEAD ~ a respective flow system } between { TAIL ~ said clamping device } and said reservoir to create a measurable pressure drop in a fluid passing therethrough
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH