Hi Chris My concern was not the magnetization of the watch movement but the induction of eddy currents into the balance wheel which will cause drag.
The act of moving the watch into the field of the pickup could cause the watch to start running more slowly. You will be getting a strong signal but it will be the wrong signal. Dave > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Chris Albertson > Sent: Friday, April 18, 2014 08:44 > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Measuring the accurcy of a wrist watch > > On Thu, Apr 17, 2014 at 11:12 PM, Hal Murray > <[email protected]>wrote: > > > > > > > Steel makes very good springs. Are there any non-magnetic > materials that > > are > > close? > > > > I think they can use some kind of non-magnetic stainless steel > > Also this might be a moot point because I got a good strong signal by > placing the watch on top of the guitar strings. I did not > have to restring > the guitar. The wall clock works even some inches away. > You don't have > to get really close to the magnets. If you were building a > sensor, just > use a plain iron core and 1/4 pound of #40 wire > > > > > > -- > > Chris Albertson > Redondo Beach, California > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
