French sector by Canivet,

French sector, 1751-1774.
Brass French sector by Canivet, Paris, 1751-1774. French sectors are less complicated than English sectors. They are also used for calculations involving proportions of length, area and volume.The lines radiate from the centre of the hinge.
 
Currently on display in:
Mathematics
Year made :
1751-1774
Inventory number :
1917-94