....I dabble all over the place :) I struggle with the same affliction, on occasion getting something done anyway... The most accurate pendulum clock to date seems to have been built by this guy: http://en.wikipedia.org/wiki/Edward_Thomas_Hall You may also have heard of him in connection with the unravelling of the "Piltdown Man" hoax... --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .