Signedunsigned
FunctionApparatus to demonstrate the motion of Jupiter's four satellites. A similar instrument is depicted in Diderot's Encyclopedie.
A video with information on the design and use of a jovilabe, produced by Museo Galileo, is available on their website here.
Primary SourcesDenis Diderot and Jean le Rond d'Alembert, Encyclopédie, ou dictionnaire raisonné des sciences, des arts et des métiers (Paris, 1751-1766), astronomical supplement, plate 1, 152.
ProvenanceDrecker Collection; purchased by David P. Wheatland in 1959.