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