{HEAD ~ The arcuate shape} of {TAIL ~ the trough bottom} results in 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 
of
{ HEAD ~ The arcuate shape } of { TAIL ~ the trough bottom } results in 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 REL TAIL 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 OTH OTH OTH OTH