[time-nuts] 1937 Time Standard

[paul swed]

Some good articles I have read several that you sent Tom. Its funny such
great information if you just search on the right terms.
But then I appreciate the fact that you sent great links. No guessing.
More to go and read.
Regards
Paul
WB8TSL

On Sat, May 21, 2016 at 4:50 PM, Tom Van Baak <tvb at leapsecond.com> wrote:

> Hi Thomas,
>
> > I was wondering if anyone knew what the "state of the art" time standard
> was in the 1937 ?
>
> The 1930's were an exciting time in this regard.
>
> The best time standards (in vacuum pendulum clocks) were those used by
> astronomers. Google: Shortt-Synchronome.
>
> Laboratory quartz clocks had just been developed. During this decade the
> best pendulum clocks were compared to the best quartz clocks. Google:
> Marrison Loomis Shortt
>
> And in the race between these two technologies, it was shown in 1936 by
> Scheibe and Adelsberger that irregularities seen by astronomers were due to
> the earth itself and not the pendulum or quartz clocks. This eventually led
> to the leap second. It was common to use a set of 3 clocks to do the
> comparison (sound familiar)
>
> To get a sense of the world of precise time in the 1930's I would
> recommend reading the following, each of which mentions something about the
> past century of timekeeping.
>
> The Evolution of the Quartz Crystal Clock
> http://www.ieee-uffc.org/main/history-marrison.asp
> https://ia902701.us.archive.org/25/items/bstj27-3-510/bstj27-3-510.pdf
>
> Time – the SI Base Unit “Second”, by Andreas Bauch
>
> https://www.ptb.de/cms/fileadmin/internet/fachabteilungen/abteilung_4/4.4_zeit_und_frequenz/pdf/2012_Bauch_PTBM_125a_en.pdf
>
> The Evolution of Time Measurement, Part 2: Quartz Clocks
> http://tf.boulder.nist.gov/general/pdf/2533.pdf
>
> Atomichron: The Atomic Clock from Concept to Commercial Product
> http://www.ieee-uffc.org/main/history-atomichron.asp
>
> Precision time and the rotation of the Earth, by Dennis McCarthy
>
> http://journals.cambridge.org/download.php?file=%2FIAU%2FIAU2004_IAUC196%2FS1743921305001377a.pdf
>
> Some Aspects of Precision Time Measurement -- 1930's German quartz, Lothar
> Rohde, etc.
> http://pubs-newcomen.com/tfiles/75ap119.pdf
> http://www.cdvandt.org/PTR%20quartz-clock.pdf
> http://www.cdvandt.org/CFQ.pdf
> http://www.cdvandt.org/BIOS-1316.pdf
>
> I have more links and PDF's to share. But let's first find out how deep an
> answer you actually want.
>
> Thanks,
> /tvb
>
> ----- Original Message -----
> From: "Thomas D. Erb" <tde at electrictime.com>
> To: <time-nuts at febo.com>
> Sent: Saturday, May 21, 2016 11:40 AM
> Subject: [time-nuts] 1937 Time Standard
>
>
> >I was wondering if anyone knew what the "state of the art" time standard
> was in the 1937 ?
> >
> >
> >
> >
> >
> >
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