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.
$59.00 more info
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
Leonardo DaVinci's Cam Hammer
This cam-operated automatic hammer is a perfect addition to anyone's collection of Leonardo DaVinci's works!
$24.95 more info
The Compound Gear Train
This Gear-Train model kit is a great way to demonstrate how compound gear ratios can reduce or increase torque and the effect that has on power and speed.
$24.95 more info
Perpetual Motion Machine
The classic "overbalanced wheel" 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.
$98.00 more info
The Lever Paradox
When discussing levers, Archimedes said: "Equal weights at unequal distances are
not at equilibrium." unfortunately, Archimedes never saw our Lever Paradox, where equal weights at unequal distances
do balance!
$24.95 more info
The Ferris Wheel
The Ferris wheel. A tower that moves, a ride that towers, a bridge between the ground and the sky. First invented in 1893 for the World's Fair in Chicago by George Washington Gale Ferris.
$98.00 more info