The apparatus 1, wherein said second and third reflectors each respectively describe in {HEAD ~ cross section}, segments of parabolas intersecting one another, each of said segments of {TAIL ~ parabolas} lying along a generally arced line 
The apparatus 1 , wherein said second and third reflectors each respectively describe in { HEAD ~ cross section } , segments of parabolas intersecting one another , each of said segments of { TAIL ~ parabolas } lying along a generally arced line
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH