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