An early brass gunner’s level and sight bearing the unknown Dutch or German signature “Geronimus O. Gendert” and dated “1632”.
The nice decorative level measures 9,5×12 cm and its preserved in a 18th century leather case refurbished recently.
“Instruments such as Zorn’s, which combine a level and sight, often have the inconvenience that the plummet obscures the sighting holes when the instrument is level. In this anonymous example, the problem is overcome by suspending the sight holder freely and dispensing with a separate plummet. The pointer at the end of the sight holder moves over an arc of slightly more than 60° whose scale of equal parts runs 6-0-6. Unlike many levels, the arc simply screws into the arched foot rather than being formed from a solid piece of brass.”
See Geometry of war : https://www.mhs.ox.ac.uk/geometry/cat22.htm
And for the Zorn example, see here :
A rare instrument which can be documented for the discovery of a new German or Dutch maker.
Fine working condition.
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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.