There's a good writeup on accuracy on wikipedia- http://en.wikipedia.org/wiki/COSC
includes a handy table comparing mechanical movement and quartz movement requirements. To be considered a chronometer, the daily rate must be within -4 to +6 secs/day. The stability of the rate over time is more important than the actual rate.
(Interestingly- any quartz watch or clock I have is much more accurate than my Hamilton Model 21 ship's chronometer!- a video of one of these beauties-
http://www.youtube.com/watch?v=We1dLNXiBj0) -- Paul Nelson W5GNF "When I go, I want to go quietly, in my Ames, Iowa sleep, like my grandfather- not Senior Engineer (Retired) screaming, like his passengers." Sauer-Danfoss Company (drhy...@qwest.net) "More hay, Trigger?" ex-Cessna 140 N77149 (sigh) "No thanks, Roy, I'm stuffed." _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
