The rotation axle 16 is driven by a rotary drive 19 in {TAIL ~ the usual way} with an adjustable speed of {HEAD ~ rotation} 
The rotation axle 16 is driven by a rotary drive 19 in { TAIL ~ the usual way } with an adjustable speed of { HEAD ~ rotation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD