Portable diptych sundial
Not on view
The punched decoration and the use and layout of two of the dials on this instrument are very similar to those found on a group of ivory diptych sundials, more usually with a special variety of azimuth sundial, including one which is known to have been made during the second half of the seventeenth century in Dieppe, France, by Charles Bloud, the inventor of the type, by Gabriel Bloud and by Jacques Senecal. Examples exist in substantial numbers in most of the major French and English collections of sundials.
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