Apparatus 2 wherein {HEAD ~ said rotary scanner} comprises {TAIL ~ a flat mirror} for reflecting visible light which has been radiated by said line source and reflected from the surface of said trough type reflector 
comprises
Apparatus 2 wherein { HEAD ~ said rotary scanner } comprises { TAIL ~ a flat mirror } for reflecting visible light which has been radiated by said line source and reflected from the surface of said trough type reflector
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH