The apparatus also includes a funnel disposed at {HEAD ~ one end} of {TAIL ~ the trough}  
of
The apparatus also includes a funnel disposed at { HEAD ~ one end } of { TAIL ~ the trough }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH