Tom Van Baak said the following on 04/21/2007 01:14 AM:
> See ADEV of a Hamilton M21 Ship's Chronometer:
> 
>     http://www.leapsecond.com/pages/m21/

I'm curious -- how did you pull the data?

My first guess would be a microphone to pick up the ticks, followed by a
little dsp...

John

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