The classic overbalanced wheel, a so-called "perpetual motion machine", as designed by French Architect Villiard De Honnecourt in about 1235, and studied extensively by Leonardo Da Vinci in the late 1400's.
$169.00 more info
It was invented in China, about 2600 years ago, and is one of the most precise machines in ancient history. It is a non-magnetic compass, and the oldest example of differential gearing in the world.
$79.00 more info
This Easy Assembly Version of our popular Chinese
South Pointing Chariot comes with many of the same
features but has been re-engineered to reduce
assembly time and increase accuracy of the
$59.95 more info