A rare rectangular graphometer by Gourdin, dated 1781
€1,800
Circa
1781
Country of manufacture
France
Description
Rectangular graphometer dated 1781 by Pierre Gourdin.
An unusual shape for an 18th-century French brass graphometer. It is signed and dated “Gourdin au Quart de cercle à Paris 1781.”
This graphometer is rectangular, with two water levels, two fixed sights, and an rotable alidade with two sights.
On the back, it bears no trace for a ball joint or a support.
It was therefore used directly on the planchette or perhaps attached to the board from one side empty.
Thus, the two levels were used to bring the instrument perfectly level.
We have been unable to find any other similar graphometer in the ancient or modern literature. A very unusual shape.
The condition is excellent. The size is 19 x 11.8 cm.
Ask the Dealer
Dealer information
Le Zograscope
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/
