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