The apparatus includes a pair of laterally extending illumination lamps and a pair of {HEAD ~ trough shaped reflectors} for collecting light from the illumination lamps and focussing {TAIL ~ one dimensional images} of the lamp filaments along a common line extending across the document 
for focussing
The apparatus includes a pair of laterally extending illumination lamps and a pair of { HEAD ~ trough shaped reflectors } for collecting light from the illumination lamps and focussing { TAIL ~ one dimensional images } of the lamp filaments along a common line extending across the document
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH