In this manner, gravity acting upon {HEAD ~ the contents} in {TAIL ~ the inverted reservoir} provides the contents emptying force necessary to expel the contents 
in
In this manner , gravity acting upon { HEAD ~ the contents } in { TAIL ~ the inverted reservoir } provides the contents emptying force necessary to expel the contents
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH