Bob,
Well, back from my days on the High School Yearbook, I remember that font size actually had a definitive relationship to real world measurements. If I remember correctly, 36pt type was such that a capital letter would be 1" tall.
With a computer never knowing how large a monitor it is going to be connected to, this relationship has gotten fuzzy over the years. But on an ebook reader, where one knows how large the screen will be, it should be easy to scale the letters such that the pt size is connected to the actual screen size seen.
--
Bill
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