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Products

This is our collection of products for sale. Click the title or picture to see a complete description.

If you would like to make a purchase, please use our contact page.

Orrery Picture James Ferguson's Mechanical Paradox Orrery

This is a working reproduction of an Orrery built in 1750 by the Scottish astronomer James Ferguson. This is called the mechanical paradox orrery because the gear train is of an unusual design that illustrates the counter-rotating motions of the Moon's nodes and the apogee of it's orbit.

$995 Available
Demonstrator Picture Mechanical Paradox Demonstrator

This is a working gear train demonstrator for James Ferguson's Mechanical Paradox Orrery. It is designed to be shared with a classroom or passed around a lecture audience. The demonstrator lets people experience the differential motion of the gears first-hand by rotating the knob below the base.

$295 Available
Napier's Bones Napier's Bones

This is a museum quality presentation set of John Napier's numbered rods designed for multiplication, division, and the extraction of roots. Made of the finest materials, this will last for generations - carrying Napier's invention along to future generations.

$295 Available
Machinist's Clock Machinist's Clock

This is the ultimate man cave or shop clock, machined from aircraft grade aluminum to give a new level of cool to the bench or desktop.

$260 Available
PI Paperweight ThinkWeights

ThinkWeights are paperweights engraved with important numerical constants, equations, and other things intended start a conversation. ThinkWeights are rotary engraved from aircraft grade aluminum to provide lasting value and a great heirloom to pass along to future generations.

$79 Available
Lever Paradox Lever Paradox

The lever paradox is a deceptively simple mechanism that inspires curiosity prcisely because it does nothing when it looks like it should be doing something.

$175 Available
HP-01 Battery Tool HP-01 Battery Tool

The legendary HP-01 calculator watch, first introduced in 1977, is highly prized by collectors. This tool is designed to facilitate the most careful removal and replacement of the back cover for changing the battery without risking damage to the case.

$79 Available
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