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#7250 Ivory Dieppe 'Bloud' magnetic azimuth diptych sundial, France ca. 1660.
SOLD Dimensions: 76 x 59 x 13mm, signed: 'C.Blovd, A.Dieppe'. This type of dial has an equatorial- and a dolar dial on top and a moon- and perpetual calender on the bottom. This dial could only be used when the magnetic declination is zero. This happened only arround 1660. By 1670 the magnetic declination was 3 degrees west.
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Ivory Dieppe 'Bloud' magnetic azimuth diptych sundial, France ca. 1660.
Ivory Dieppe 'Bloud' magnetic azimuth diptych sundial, France ca. 1660.
Ivory Dieppe 'Bloud' magnetic azimuth diptych sundial, France ca. 1660.
Ivory Dieppe 'Bloud' magnetic azimuth diptych sundial, France ca. 1660.
Ivory Dieppe 'Bloud' magnetic azimuth diptych sundial, France ca. 1660.
Ivory Dieppe 'Bloud' magnetic azimuth diptych sundial, France ca. 1660.
Ivory Dieppe 'Bloud' magnetic azimuth diptych sundial, France ca. 1660.
 
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