"Lurking Luser" wrote in message
.net...
Centro de Observação Astronómica no Algarve has a little program to make
diffraction gratings with a home printer. But it has some limitations.
First
the resolution is maxed at 720 dpi and second the pattern is round wasting
a
large amount of the transparency.

James,

I believe that the Amateur Scientist column in Scientific American had at
least one article on actually ruling a diffraction grating. (Just in case
anyone is really ambitious.)

Clear skies, Alan