>> I've heard of accelerometers >> which don't detect static acceleration fields like gravity, > > Let me guess, these were on the same web site selling free energy > perpetual motion machines? No, the ones who sell rate gyros and rate (dynamic) accelerometers. Funny you're asking that. Peter -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads