Graham Tourbillon Orrery Looks to the Heavens
In 1713, George Graham built a clock, which used a mechanical movement to power a heliocentric model of the planets. The mechanical solar system, presented to the fourth Earl of Orrery, was called an Orrery, and because of its precision, all subsequent planetary models …
Imported: 11. Sept 2013 (13:48), Monochrome Watches
