#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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