Orrery planetary model by George Adams, 1789-1795

Drum model brass orrery, 1781-1795.
Dated to the middle of the eighteenth century, this planetary model was made by the famous London instrument maker, George Adams. Called an orrery or planetarium, it is a demonstration model to show the motions of the Earth, Moon and planets around the Sun. It has a brass drum base with pedestal stand and seven planets out to Uranus on long rod-arms. Such devices became popular during seventeenth century especially after Sir Isaac Newton published his universal theory of gravity. To reproduce the motions of the solar system this model employs a hand crank to drive gear wheels. This fine orrery would have been the property of a wealthy individual with an interest in astronomy.
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