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 <[email protected]> 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" <[email protected]> > To: <[email protected]> > 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 ? > > > > > > > > > > > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
