A very fine and large pair of 17th century brass and steel single-handed navigational dividers. Constructed with a five leaf friction joint with unusually large globe head, at 7 ¾ inches in length these are a good size for such an instrument. Historically used for navigation, they are similar to the pair depicted in the 1653 portrait of Elias Allen, see final image.
Similar examples are in the London Science Museum collection:
19.5 cm / 7 ¾ inches
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Instrumentum 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 email@example.com. Image galleries of our inventory can be viewed on Pinterest and Facebook at the following links: