Mechanical timepieces do it for me, though I no longer have a nice example. Recently ran across this... http://www.90thidpg.us/Reference/Manuals/TM%209-1575.pdf An Army Field Manual on the maintenance of watches & clocks, circa 1945! --=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 .