Rare Dartois round Vernier scale by Wéry for maritim chart, circa 1870

Rare Dartois round Vernier scale by Wéry for maritim chart, circa 1870

950 euros



Country of manufacture


Categories: Maritime, Scientific, Navigational instruments, Other Maritime Antiques, Drawing Instruments, Surveying Instruments & Mining


A rare example of an instrument called “Vernier déclinaison” and signed “Breveté Jacques Dartois” and “Alexis Wéry Fab[rican]t à Liege”.

The instrument has a rotating circle divided into 360 degrees, a small ruler divided into two times ten millimeters on either side of a true north (the Vernier scale) and a long arm serving, it seems, to measure or correct the magnetic declination on maritim charts.


We don’t know anything about this Jacques Dartois from Belgium. 

But we know that Alexis Wéry was active in Liège between 1870 and the end of the 19th century. His widow signed Veuve Wéry at the very beginning of the 20th century.

Length 54 centimeters. 

Beautiful condition for this rare marine instrument.

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FR 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/

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