History of Science Museum: Collection Database Search

Narratives

Inventory no. 22258 - Former Display Label

A pair of English ARMILLARY SPHERES
c.1700

Brass and silvered brass. Made by John Rowley. These armillary spheres are constructed so as to demonstrate respectively the planetary theories of Ptolemy and Copernicus. For orientating the instruments there are small compasses fitted under the horizon bands, and the bases are fitted with levelling screws. There are separate graduated arcs for measuring altitudes.

This instrument illustrates the Copernican theory. The turning of the Earth upon its axis is effected by a train of five cogwheels. This instrument is signed, "I ROWLEY FECIT"; it is undated

[Orrery Collection, no. 7]
Lent by Christ Church.

Other narratives:

Related Objects: