The arcs intersect at point 82, and {HEAD ~ the exit apertures} of both cusps are defined by {TAIL ~ the line} 76 82 which lies in the plane of reflectors 73 and 75 
The arcs intersect at point 82 , and { HEAD ~ the exit apertures } of both cusps are defined by { TAIL ~ the line } 76 82 which lies in the plane of reflectors 73 and 75
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH