[time-nuts] 1937 Time Standard
Dave Brown
tractorb at ihug.co.nz
Tue May 24 02:10:21 EDT 2016
In the context of public time dissémination, the Shepherd master and gate
clocks are worth noting as well-
http://collections.rmg.co.uk/collections/objects/79636.html
But somewhat earlier than 1937......
DaveB, NZ
----- Original Message -----
From: "Tom Van Baak" <tvb at LeapSecond.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Tuesday, May 24, 2016 12:57 PM
Subject: Re: [time-nuts] 1937 Time Standard
> Thanks Paul.
>
> I accumulate a pile of PDF's over time and when the right question shows
> up in the list I dig them out. It turns out Thomas, the OP, is doing a
> report on public clocks, including synchronous motor clocks. He added
> another source:
> https://clockhistory.com/telechron/company/documents/warren_1937/index.html
>
> The idea of time standards and time transfer methods has not changed over
> the centuries. What these guys did way back with telegraph (Western Union)
> or with 60 Hz (Telechron) we now do with WWVB, NTP, GPS, etc. The decimal
> point moves.
>
> The history of 60 Hz mains frequency, in particular, is extremely
> fascinating.
> There's some basic intro here:
> https://en.wikipedia.org/wiki/Utility_frequency#History
> Have a look at that table of frequencies used in 1897!
>
> There's a great article (free, IEEE) on the use of 25 Hz at Niagara Falls:
> http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=4412948
>
> And some wonderful information here:
> http://ethw.org/Early_Electrification_of_Buffalo
>
> Finally, this 3 part masterpiece:
> http://ethw.org/Archives:Transformers_at_Pittsfield,_part_1
> http://ethw.org/Archives:Transformers_at_Pittsfield,_part_2
> http://ethw.org/Archives:Transformers_at_Pittsfield,_part_3
>
> If nothing else, everyone should take a quick look at the photos in the
> above 3 URL's. Mini-Circuit transformers these are not.
>
> /tvb
> ----- Original Message -----
> From: paul swed
> To: Tom Van Baak ; Discussion of precise time and frequency measurement
> Sent: Monday, May 23, 2016 4:23 PM
> Subject: Re: [time-nuts] 1937 Time Standard
>
>
> 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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