Use the 'xfontsel' (from the xbase-clients package) to see what fonts
look like. If you run it with the -print option it will print the font
you have selected into the shell... for easy copy-and-paste after.
Anyway, it's not the font weight (the 3rd entry in the X font string)
that you want to change. You want to set a higher point size.
xterm -font '-*-*-*-*-*-*-*-400-*-*-*-*-*-*'
400 is a bit much for my taste :)
If you want to get fonts manually and put them into the .fonts dir, see
this:
http://www.jukie.net/~bart/blog/small-fonts
Your interests are the opposite to mine -- I wanted smaller fonts -- but
you can use the same scripts and HOWTO.
-Bart
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WebSig: http://www.jukie.net/~bart/sig/