A very early example of one of the first French slide rule preserved signed by Lenoir and datable between 1820 and 1832.
We know that Etienne Lenoir started to produce his first slide rule in 1820. Étienne Lenoir died in 1832 and his son Paul-Etienne, who taken over the family business died in 1827. So we can date this first form of French slide rule from 1820 to 1827-1832, not later.
The condition is excellent and the ruler slides perfectly. It measures 26cm lenght
Ask the Dealer
Established by Alexandre Piffault in 2014 and based in Paris at 5 rue de Condé, 75006, very close to Odéon, Le Zograscope specializes in antique and rare books in Science, Medicine and Technology, and rare antique instruments in the same fields. We have especially a strong interest in early and continental microscopy, early and special mathematical/drawing instruments, medical and surgical instrument, and rare technology.
Personnal website : https://www.lezograscope.com/