The dial angle shows clearly that the city inscribed on this instrument is the one known in recent times as Aix-en-Provence. Aix is a cathedral city and houses the faculties of humanities and law of the university of Aix-Marseille. Louis XII established there the parlement of Provence in 1501 which continued until 1789. A study of the city, its inhabitants and dwellings, was made in the seventeenth century, where the maker of this surveying instrument is described. It is reported that in rue de Jouques during the first half of the seventeenth century, lived Jacques Maretz, professor of mathematics, a geometer and engraver. He was the author of 'A geometrical plan of the city of Aix' in 1622, and was still alive in 1642. The graphometer was invented by Philippe Danfrie (1532-1606), and published at Paris in 1597. The present device is basically the same, and is engraved with great care, skill and knowledge, producing a luxuriously-cased instrument, perhaps for a great civic occasion.