I'm looking for literature that speaks to the relationship between letter, word, and line spacing. There is the axiom that line spacing should be larger than word spacing, and word spacing larger than letter spacing, but are there suggested proportions that speak to what those ratios should be? Understanding that there are many variables that influence spacing such as measure and character width, the relationship between spacing elements seems an scantly explored avenue.
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I always “eyeball” the width of the space character, never use a formula.
Else, I'm a +1 for Cyrus Highsmith's book Inside Paragraphs,
and Frank Blokland himself or his work may help.
http://books.google.ca/books/about/Letterletter.html?id=L6AQAQAAMAAJ&redir_esc=y
pages 126 to 128.
Exact proportions aren't specified.
http://www.kindersleyworkshop.co.uk/shop/optical-letter-spacing.php
http://www.kindersleyworkshop.co.uk/spacing/
http://typophile.com/node/19789
The width of /i/ (including sidebearings) is mentioned by a few posters.