A Butterfield type sundial, XVIIIth

A Butterfield type sundial, XVIIIth

Delure, Jean Baptiste-Nicolas (Parigi, 1695-1736)

A Butterfield type horizontal silver sundial

in 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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