The Graham Geo. Graham Orrery Tourbillon: Analyzing A Mechanical Wonder (Plus Video)
The Geo. Graham Orrery Tourbillon is one of less than a handful of mechanical watches ever made to display the orbits of planets, and it’s the only one with a tourbillon rotating behind the sun. Come with me on a journey to discover a brief history of the orrery right up to this wrist-sized marvel.