Very fine and large (10 ¼ inches / 26cm) 17th century navigational dividers in exceptional condition. Historically used for chart reading or mathematical calculations, these antique dividers are constructed with steel legs and a five leaf octagonal “ball head” friction joint typical of the period. The pristine condition and unusually large size make this an outstanding example. Probably French or German, though this pair was purchased in the UK.
Very similar (though significantly smaller) dividers can be seen at the Harvard collection of scientific instruments and in past sales:
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Instrumentum is based in the United States and specializes in high quality 17th and 18th century scientific instruments for architecture, mathematics and navigation. We have collected antique instruments for over 20 years with a focus on early and rare European architectural drafting sets, dividers, and rules. If you are interested in something particular please contact us at firstname.lastname@example.org. Image galleries of our inventory can be viewed on Pinterest and Facebook at the following links: