Could someone please help direct me to more information on the classification of sundials.  I see that John Davis' Glossary includes many definitions, but I was hoping to find one that was organized more like a flow chart or genealogy chart.  Hopefully it would include basic types with lines to sub types and multiple lines for ones with several origins etc.  How is  the organizational system used by the Patient Office?  I seem to remember it not being completely usable, or at least difficult to use, the way it is.  Thank you, and I sure enjoy all of the dialog this list generates!

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