An Empire period Barometer

A 1st Empire period carved gilt wood barometer.
Signed "Par Chevallier Ingénieur Opticien de SS M le Roy de Westphalie et Membre de plusieurs Académies, Sociétés savantes./ Angle des Quais de l'horloge n°1/ vis à vis du Pont au Change./ A Paris"
France.
19th century.

After Torricelli (1608 - 1647).

The "ingénieur" Chevallier was the optician of the king of Westphalia, brother of Napoléon I. Jérôme Bonaparte (1784 - 1860), French prince and Imperial Highness. He became the king Jérôme Napoléon, French prince, king of Westphalia from 1807 to 1813.