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Verhandeling van de sphærische of klootsche zonne-wysers; namelyk, hoe men op een sphæra convexa, of ronde kloot, allerley zonnewysers meetkonstig beschryven kan.Leeuwarden, Jacques Alexandre de Chalmot, 1761. 8vo. With 50 figures on 21 folding engraved plates by Jan Caspar Philips. Later half vellum, made from early materials.
- Bierens de Haan 2521. First and only edition of an important work on spherical sundials by the Dutch mathematician Johann Hermann Knoop (1700-1769). It describes how to measure and construct different types of sundials, including one inside a hollow half sphere and a "gnomic" armillary sphere. The plates, engraved by Jan Caspar Philips (1690-1775), depict these sundials. They are bound at the end of the text and can be folded out while consulting the text.Knoop was curator of the gardens of Princes Maria Louisa in Leeuwarden, and teacher in mathematics in the same city.With two small stamps and a shelf label on title-page. Title-page browned and thumbed, with a waterstain in the lower margin, margins slightly browned throughout, with a few small spots. Otherwise in good condition, wholly untrimmed and with most bolts unopened. Binding also in very good condition.
      [Bookseller: ASHER Rare Books]
Last Found On: 2017-06-22           Check availability:      ZVAB    


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