Illustration: Ferguson's Mechanical Paradox Orrery
I have had the great pleasure of being hired to shoot two beautiful examples of a hand-machined "Ferguson's Mechanical Paradox Orrery" made by Jim Donnelly of Albany, Oregon. He has written one article about the build process for "Digital Machinist" magazine and co-wrote another for The British Horological Institute Limited's "Horological Journal" and asked me to shoot photographs to accompany his articles.
Here's a quick description about the orrery written by Jim:
"Designed circa 1750, the core of the mechanism depends on gears of differing ratios to illustrate the movement of the moon's nodes and apogee as the earth revolves around the sun. It can be used to illustrate many things, including eclipses." Jim further states he was inspired by Ian Coote, see Ian's page about the orrery here.