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