The document 10 is moved in direction 14 so that all portions of {HEAD ~ the document} are eventually illuminated by the line of light, or {TAIL ~ scan line} 16, which is produced by the illuminating devices of the scanner 
The document 10 is moved in direction 14 so that all portions of { HEAD ~ the document } are eventually illuminated by the line of light , or { TAIL ~ scan line } 16 , which is produced by the illuminating devices of the scanner
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH