antique

Restoring a Late-90s Packard Bell Multimedia PC

Restoring a Late-90s Packard Bell Multimedia PC

Look over the shoulder of an antique computer collector as he’s restoring a homely PC from the last century.

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How Middle Schoolers Reinvented the First Text Message System

How Middle Schoolers Reinvented the First Text Message System

Looking at historical inventions is a way for students to interact with technology and understand it.

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Coffee Maker: Grandpa’s Grinder

Coffee Maker: Grandpa’s Grinder

Come explore the insides of an old fashioned crank coffee grinder.

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Tool Tales: The Pump Drill

Tool Tales: The Pump Drill

A pump drill is an ancient tool traditionally been used to generate friction heat for starting fires, as well as for boring holes. The principle of a pump drill’s operation is similar to the button spinner or whirligig, in which rotational momentum is built and maintained by repeated twisting and untwisting of a cord. After reading about them in a book about primitive technology, I got interested in the idea of a “modern” pump drill, operating on the same principle as the ancient tool but manufactured from industrial-age materials instead of wood, stone, and bone.

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Beautiful 18th-century cometarium

Beautiful 18th-century cometarium

This mechanical model of a comet’s orbit, based on the action of elliptical gears, is dated to 1766, and is housed at Harvard’s Putnam Gallery. From which:

This apparatus was designed to demonstrate how the speed of a comet varies in its orbit according to Kepler’s law of equal areas. The comet Benjamin Martin chose for this instrument is Halley’s Comet, which goes around the Sun every 75 1/2 years. Martin began producing cometaria before Halley’s Comet made its predicted return, and so was betting that Halley would prove correct in his theory.

Interestingly, the device turns out to be not an entirely accurate demonstration of Kepler’s second law. Physicist Martin Beech of the University of Regina has studied the history and mechanics of cometaria at great length. His clearinghouse page is an excellent source of detailed information.

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