The Leuven atelier that supplied the greatest Renaissance princes with terrestrial globes, graphometers and sundials is well represented here. One of the masterpieces of the atelier is the extraordinary armillary sphere, made by Gauthier Arscenius in 1575. With all its rings and hoops, it gives a three-dimensional view of the universe as observed at that time. The graphometers, celestial spheres reduced to a two-dimensional disc, enable the position of the stars in the heavens to be calculated, as well as the various astronomical phenomena to be measured.

In the gallery, discover the old instruments used for triangulation; they look like the instruments used by Mercator to draw the first geographical maps: trigonometer, circular protractor and graphometer. Discover, too, the full instrument case carried by 17th-century engineers in the field.

Measures and weights are likewise represented, with old standard weights of the towns, with moneychangers’ boxes and with rulers graduated according to local measures, all dating from before the introduction of the metric system.

Besides a few clocks in the chronological circuits, there is also a specific clock section, which includes a comprehensive collection of valuable timepiece jewellery. Also on display are a number of automatic clocks ascribed to the Liège clockmaker Hubert Sarton.