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Howard Hoover
New member
Username: Howard_hoover

Post Number: 9
Registered: 10-2005
Posted From: 4.160.54.216

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Posted on Thursday, January 12, 2006 - 11:42 pm:   

www.gizmology.net/tracked.htm
also this link: www.scmec.us/diffs3.html Basically the same thing but with
explanations. Kind of hard to read though.

This guy has lots of interesting stuff on his site. He even built a working scale model of a tank for his son to drive, out of wood.