Portable diptych sundial
Probably by Charles Bloud
Not on view
Although Charles Bloud was the inventor of this variety of azimuth sundial, several other Dieppe sundial makers, including Gabriel Bloud and Jacques Senecal, are known to have made and signed similar sundials. The principle by which their sundials worked is based on a variation in the magnetic declination of the area around Dieppe which existed for only a short period in the seventeenth century, beginning about 1666.
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