The Cycloidal Gear Drive The Cycloidal drive is a fascinating power transfer device that creates a two-to-one gear ratio between the input and the output, without changing the direction of rotation.
   $29.95  more info

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The Chinese South Pointing Chariot 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.
   $69.00  more info

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The Chinese South Pointing Chariot
- Easy Assembly Version 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 mechanisms.
   $49.00  more info

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The Rubber Band Shooter kit How does an escapement work? With this rubber band shooter kit, you can build an all-wood rubber band shooting escapement mechanism. It's not a six-shooter, this rubber band gun shoots eight shots between loading!
   $14.95  more info