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![Astronomical Ring of an unusual type, showing the side of the instrument "Butterfield Paris". Undated, circa 1690. This instrument is closer to an equinoctial ring dial than most astronomical rings. | Wellcome Collection Astronomical Ring of an unusual type, showing the side of the instrument "Butterfield Paris". Undated, circa 1690. This instrument is closer to an equinoctial ring dial than most astronomical rings. | Wellcome Collection](https://iiif.wellcomecollection.org/image/M0017339/full/full/0/default.jpg)
Astronomical Ring of an unusual type, showing the side of the instrument "Butterfield Paris". Undated, circa 1690. This instrument is closer to an equinoctial ring dial than most astronomical rings. | Wellcome Collection
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![The place of the UERD in the armillary section of the classification... | Download Scientific Diagram The place of the UERD in the armillary section of the classification... | Download Scientific Diagram](https://www.researchgate.net/publication/343278227/figure/fig4/AS:918454957797376@1595988134006/The-place-of-the-UERD-in-the-armillary-section-of-the-classification-scheme-of-sundials.jpg)
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![A c. 1720 Universal Ring Dial - Antique Scientific Instruments, Globes and Cameras 2018/04/04 - Realized price: EUR 7,500 - Dorotheum A c. 1720 Universal Ring Dial - Antique Scientific Instruments, Globes and Cameras 2018/04/04 - Realized price: EUR 7,500 - Dorotheum](https://www.dorotheum.com/fileadmin/lot-images/39D180404/normal/ringsonnenuhr-um-1720-5100935.jpg)
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![Astronomical Ring of an unusual type, signed "Butterfield Paris". Showing the opposite side of the instrument to that on which Butterfield's signature occurs. Undated, circa 1690. This instrument is closer to an Astronomical Ring of an unusual type, signed "Butterfield Paris". Showing the opposite side of the instrument to that on which Butterfield's signature occurs. Undated, circa 1690. This instrument is closer to an](https://iiif.wellcomecollection.org/image/M0017340/full/760%2C/0/default.jpg)
Astronomical Ring of an unusual type, signed "Butterfield Paris". Showing the opposite side of the instrument to that on which Butterfield's signature occurs. Undated, circa 1690. This instrument is closer to an
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