Ordinal numerals

[Matej Cepl]

Hi,

just a question from typohgraphy -- how much binding is use of
superscript of {st,nd,th} of ordinal numerals (in name of
century for example)? Or is it better to use normal-size fonts? I
have already prepared \noth macro

\newcommand{\noth}{$^{\mathrm{th}}$}

but I am now not sure, whether it is right to use it all. May
anybody help me?

                Thanks

                        Matej Cepl