Architect and Mathematical set Claude Langlois C.1720 cased in shagreen set. with proportional pied de roy, demi pied de roy,
compas , divider, a fine plumb bob, protractor.
Claude Langlois was one of the most famous scientific instruments’s maker. established in 1720.
At Quai de l’horloge en 1727.
He was the official maker for French astronomer.
Provided the Observatory of Paris in 1730, 1732, 1738
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