Sarah, You should visit the "Historisches Museum" in Frankfurt, which have a good collection of sundials and other astronomical and scientific instruments. You may find the museum by searching the Internet with Google for "Historisches Museum Frankfurt". There is also a catalog of their collection (which I do not have at hand, so that I cannot tell you now the exact title). However, it was made for a temporary exhibition, and only a smaller part of the items in the catalog are also in the permanent exhibition.
In case that you are interested also in historic geodetic instruments, I may arrange a visit to my institution (Federal Agency for Mapping and Geodesy) in Frankfurt. Best regards, Wolfgang Dick (Potsdam/Frankfurt am Main) -
