A 19th century brass protractor signed "l'Ing. Chevallier Opticien du Roi a Paris "

Description
A 19th century brass protractor signed "l'Ing. Chevallier Opticien du Roi a Paris "
In perfect condition except for some superficial oxidation

A brass protractor. Length 25.5 cm. Width 4 cm. 2 mm thick. Finely engraved in two scales, 1: 1250 and 1: 2500.
Signed "l'Ing. Chevallier Opticien du Roi a Paris". (Jean-Gabriel Augustin Chevalier was born in 1778 and died in 1848). The monarchy in France was restored in 1804, so this tool was made between 1804 and 1848.

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