A sequencer 12 mechanically supports the parabolic reflector 2 and is capable of turning the reflector about a vertical axis so that its beam can rotate to {HEAD ~ any direction} in {TAIL ~ a horizontal plane} through the sequencer 
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A sequencer 12 mechanically supports the parabolic reflector 2 and is capable of turning the reflector about a vertical axis so that its beam can rotate to { HEAD ~ any direction } in { TAIL ~ a horizontal plane } through the sequencer
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 HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH