Vitruvius is online (English, Latin, French) and thus searchable. Sundials are discussed chiefly in Book 9 <http://www.ukans.edu/history/index/europe/ancient_rome/E/Roman/Texts/Vitruvius/ 9.html>
but also in a section of Book 1, starting at this local link: <http://www.ukans.edu/history/index/europe/ancient_rome/E/Roman/Texts/Vitruvius/ 1.html#6.6> Those are the English pages; for the others, follow the links at each paragraph number. Bill Thayer LacusCurtius http://www.ukans.edu/history/index/europe/ancient_rome/E/Roman
