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Sundial - Magnetic Azimuth, Jacques Senecal, Dieppe, France, circa 1660 Object Reg. No: ST 025187

Portable sundial made by Jacques Senecal, Dieppe, France, circa 1660.
The upper lid contains a horizontal sundial for latitude 50 degrees north (the latitude of northern France). When the lid is opened a pivoted metal arm enables the user to set the lid at any altitude, by the scale inside the lid, thereby creating an equatorial sundial.

The underside of the lid contains a rotating disc, which provides the approximate time of the Moon's transit in accordance with its age.

The inside box gives a list of French towns and their latitudes, the cardinal directions, and a compass marked with hours as an analemmatic dial.
Acquisition Information:
Donation from Mrs W. Blackall, 1960
Discipline: Technology
Dimensions: 1.5 cm (Height), 7 cm (Width), 8.5 cm (Length)

More information

Tagged with: sundials, horology
Themes this item is part of: Science & Measurement Collection
Primary Classification: HOROLOGY
Secondary Classification: Sundials
Tertiary Classification: france
Maker: Jacques Senecal, Dieppe, France, circa 1660

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