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