A Butterfield type sundial, XVIIIth
Delure, Jean Baptiste-Nicolas (Parigi, 1695-1736)
A Butterfield type horizontal silver sundialin the original shagreen case. Sundial: 7,8 cm long
Related literature:
E.H. Higton, Sundials (Philip Wilson, 2001), pag. 86
C. Frémontier-Murphy, Les Instruments de Mathematiques
(Louvre, 2002), pagg. 61-63

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