![](https://coimages.sciencemuseumgroup.org.uk/54/235/large_thumbnail_1898_0030__0004_.jpg)
Circular slide rule for calculation in simple interest
- Made:
- France
![Circular slide rule for calculation in simple interest](https://coimages.sciencemuseumgroup.org.uk/325/514/medium_smg00047654.jpg)
Circular slide rule for calculation in simple interest, 4 3/4 inch diameter, in card, with celluloid cursor in metal mount, with pamphlet "Instruction pour l'emploi du Nouveau cercle a calculs"