{HEAD ~ The arcuate shape} of the trough bottom results in {TAIL ~ an effect} similar to an airfoil effect, whereby the aspirated air is accelerated with the consequent beneficial effect on the gathering of the fibre fleece to the shape of a fibre sliver 
results in
{ HEAD ~ The arcuate shape } of the trough bottom results in { TAIL ~ an effect } similar to an airfoil effect , whereby the aspirated air is accelerated with the consequent beneficial effect on the gathering of the fibre fleece to the shape of a fibre sliver
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH