[time-nuts] Absolute time accuracy pre-Cesium?

[Bruce Griffiths]

https://www.cambridge.org/core/services/aop-cambridge-core/content/view/FFA10ED6A784AA1E39637CC0CA93B750/S0074180900036007a.pdf/div-class-title-some-advantages-and-disadvantages-of-a-photographic-zenith-tube-div.pdf
indicates a timing error of around 6 millisec

Bruce
> On 26 March 2019 at 12:15 Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:
> 
> 
> John
> http://adsabs.harvard.edu/full/1968JRASC..62..205T
> indicates a timing accuracy of a few milliseconds was typical for the Calgary PZT.
> 
> Bruce
> > On 26 March 2019 at 11:44 John Ackermann N8UR <jra at febo.com> wrote:
> > 
> > 
> > Does anyone have a pointer to information about the absolute time 
> > accuracy (not stability) that was available via PZT or other techniques 
> > prior to the Cesium definition?  I'm doing a presentation and want to 
> > show the evolution of accuracy.  My Google-fu has failed me in finding 
> > anything pre-Atomic.
> > 
> > Thanks!
> > John
> > 
> > 
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