Directions:

Saint Médard Nitrière, saltpeter refinery run by Jean-Baptiste Courtois, present Boulevard de Strasbourg - N47 19.33 E05 03.36.
Rafferinie des Argentières, oldest saltpeter refinery in Dijon, run by Pierre Courtois - present corner of Rue de la Raffinerie and Rue des Argentières - N47 19.01 E05 03.25.
Fontaine des Suisses, historic tower for portable water and present landmark, present Boulevard de Strasbourg - N47 19.27 E05 03.48.