>... and usually about as stable as a three-legged > chair. Pseudo random regurgitation from long ago. Badly done, a 3 legged chair is horrendosuly unstable.- if c of g of load lies outside footprint you fall. Properly done, a 3 legged chair is THE ONLY stable multilegged arrangement known to man. Must be a lesson in there somewhere :-) Russell --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .