A collection of 5 astronomical instruments and a book
Butterfield à Paris, 45 x 52 mm, circa 1690
An equatorial sun dial
Case: silver, hand engraved octagonal dial-plate, fine engraved gnomon is hinged and folds flat, dial-plate with set compass, the scale is drawn for a latidude of 43°,on the reverse side of the ground plate are engraved the geographical declinations from several French and other European towns. Dial: concentric retrograde Roman hour scale.
The book is a reproduction from the eighth volume of Diderots "Encyclopédie ou Dictionnaire raisonné des sciences, des arts et des métiers" from 1765: "Horlogerie et Ofrèvrerie".