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