Book Dial (17th Century)

  • Exhibition Text

    • Ivory, glass, iron, pewter, string

      17th century, France

      As a traveler moved about, he could set the brace at the side of this dial to prop open the cover at angles match different latitudes. The compass card lists various cities and their latitudes, and the cover contains a perpetual calendar with changing moon phases.

      AMNH Hayden Planetarium Collection 2001

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