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