See <http://hugin.sourceforge.net/> for a tool that will allow you to
stitch together a larger image from partial scans. This sounds like
just the right tool to use when scanning large circuit diagrams on a
scanner that can't capture the whole document in one pass.
--
"The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download
<http://www.xmission.com/~legalize/book/download/index.html>
Legalize Adulthood! <http://blogs.xmission.com/legalize/>