Hi Sara,
Thanks for responding - I had remembered our previous discussions on the list re classifying dials, but I don't have a quotable reference to what you and your colleagues have produced that I, and the other dabblers at dialling, can refer to. Perhaps when you return home you could point us to the publication. Re cylinder dials - whoops, I'm very red-faced at dropping that clanger! What I should have said, of course, is that the gnomon always faces the Sun, not the south. Re moving dial faces, I hadn't intended this to refer to portable dials, but to dials in which the dial face and its hour lines have to be specially aligned for every reading. Thus a Butterfield dial, for example, is a portable dial but the dial is always set up just like a fixed dial, aligned horizontal & N/S. However, Regiomontanus, Capuchin, quadrants etc have to be pointed at the Sun and tilted to align them. I think this requires an entry in any classification scheme. Re nonius - I agree with you in that the formal name of a "diagonal scale" is transversals - the Second Edition of the Glossay will contain both terms as the former is sometimes found in the literature. The nonius gets a separate entry, together with a v. brief biog of Nonez. Best regards, John
