Ptolemaic Armillary Sphere, by John Rowley, London, c. 1700
|Inventory Number:|| 15386|
|Object Type:|| armillary sphere|
|Place Created:|| London England United Kingdom Europe
|Brief Description:||One of a pair of English brass and silvered armilliary spheres made by John Rowley c.1700. The instrument is signed, "I OHN ROWLEY LONDINI FECIT"; it is undated.|
See Inv 22258 for its companion item.
The pair of armillary spheres are constructed to demonstrate the planetary theories of Ptolemy and Copernicus. This instrument illustrates the Ptolemaic theory. Small compasses fitted under the horizon bands are used for orientating the instruments, and the bases are fitted with levelling screws. There are separate graduated arcs for measuring altitudes.
|Primary Inscriptions:||Signed: "I OHN ROWLEY LONDINI FECIT"|
|Provenance:||Lent by Christ Church, Oxford in 1925.|
|Collection Group:||Orrery Collection|