The "Trebouchet" sp? it was featured in Wall Street Journal some years back. It was also used on an episode of Northern Exposure. It uses some archaic principals of weights and leverage and was used in the Middle Ages as a for launching weapons over the enemies castle walls, I believe. The Northern Exposure episode shows an upright being launched in slow motion....it was AWESOME!! John Minor Piano Technician University of Illinois jminor@uiuc.edu
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