Square box in the form of a book, with a windrose on its lid and a moon dial on its back. Inside the lid are listed the places where the sundial can be used (from North Africa to Sweden). For each latitude indicated (42°, 45°, 48°, 51°, and 54°) there was a hole for inserting a string tied to the opposite end of the base. The string served as gnomon and its shadow, cast on the dial below, gave the hour on the corresponding circles. The dial carries the signature of the maker, Hans Tucher, and his snake-shaped trademark. Brought to Florence from Germany by Prince Mattias de' Medici in the first half of the seventeenth century.