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