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