[time-nuts] The first "time nut"?
daun at yeagley.net
Sun May 27 14:48:18 EDT 2007
No, that is correct. The Accutron has a predictable position error, gaining or
loosing a couple of seconds a day depending on whether the tines of the fork are
pointing up or down. (gravity effects!). They are calibrated depending on
whether it is worn on the inside or outside of the wrist, or whether on the left
or right arm. He was simply taking advantage of this phenomenon to make it gain
or loose without having to reset it. (on the original 214's there was no hack
mechanism to start and stop the movement without taking the battery out).
When the watch is worn, it's temperature is maintained at very close to body
temperature, in effect it's own "oven".
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf
Of Poul-Henning Kamp
Sent: Sunday, May 27, 2007 2:42 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] The first "time nut"?
In message <4659C94A.3030206 at febo.com>, John Ackermann N8UR writes:
>[...]and if one was gaining a half second
>on the other, he would wear it on the outside of his wrist instead of
>the inside, so that gravity changed the rate of the tuning fork [...]
I'd expect that the author got this wrong, it would be the temperature
change that did it.
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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