Re: [time-nuts] ADEV data for mechanical clocks

[Tom Van Baak]

> Does anybody have any ADEV data for mechanical clocks?  (I didn't find any by 
> google, but there was a lot of noise so maybe I missed something.)

Hal,

It's often buried in out-of-print horological books or magazines / journals / 
articles that google may or may not index.

I have some ADEV examples here:

http://www.leapsecond.com/pages/m21/ -- the classic Navy chronometer
http://www.leapsecond.com/pend/shortt/  -- see Stable32 / Timelab plots
http://www.leapsecond.com/pend/clockb/  -- go to technical links
http://www.leapsecond.com/hsn2006/  -- see dream pendulum paper

> I'd expect a watch to slow down slightly as the spring unwinds.  That 
> probably doesn't apply to clocks driven by weights.

Clockmakers are clever and implement methods to keep constant power:

https://en.wikipedia.org/wiki/Fusee_(horology)
https://en.wikipedia.org/wiki/Maintaining_power

Photo:
https://www.wired.com/wp-content/uploads/archive/images/slideshow/2007/12/gallery_time_hackers/disk.jpg
via https://www.wired.com/2008/01/gallery-time-hackers/

Diagrams:
http://www.hamiltonparts.com/m21-6.jpg
http://www.hamiltonparts.com/m21-8.jpg
via  http://www.hamiltonparts.com/hamilton.htm

Additional photos:
https://chronometerbookdotcom.files.wordpress.com/2017/11/broken-chain-labelled1.jpg
via https://chronometerbook.com/2017/11/

https://chronometerbookdotcom.files.wordpress.com/2017/02/attach-to-fusee-1.jpg
via https://chronometerbook.com/2017/02/13/27-fusee-chain-substitute/

/tvb

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Re: [time-nuts] ADEV data for mechanical clocks

[Attila Kinali]

On Tue, 06 Mar 2018 21:10:00 -0800
Hal Murray  wrote:

> Does anybody have any ADEV data for mechanical clocks?  (I didn't find any by 
> google, but there was a lot of noise so maybe I missed something.)

How about Tom's Powers of Ten?
http://www.leapsecond.com/ten/clock-powers-of-ten-tvb.pdf

Attila Kinali

-- 
It is upon moral qualities that a society is ultimately founded. All 
the prosperity and technological sophistication in the world is of no 
use without that foundation.
 -- Miss Matheson, The Diamond Age, Neil Stephenson
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[time-nuts] ADEV data for mechanical clocks

[Hal Murray]

> So, where's the ADEV plot for Bill's Q1,Q2, and Q3?

Does anybody have any ADEV data for mechanical clocks?  (I didn't find any by 
google, but there was a lot of noise so maybe I missed something.)

I'd expect a watch to slow down slightly as the spring unwinds.  That 
probably doesn't apply to clocks driven by weights.

-- 
These are my opinions.  I hate spam.



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