A very early example of a French brass sector with four sights made by a countryside maker unknown, named “François Oriot”.
The sector is made with two heavy and thick arms of brass on which side is only engraved two lignes : “Les cordes des arcs” & les “Les poligones” on one side ; and “Les partyes Esgalles” & “Les Corde” on the other side.
The sector measures 18,1 cm lenght and 7mm thichness.
An exceptionnal survivor from the early production in France of the mathematical and surveying sector during the 17th century.
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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/