This is all cool stuff, and neat to read about. What's the best (Most stable, most accurate, best adev, etc.) tuning fork oscillator made? What the lowest frequency tuning fork oscillator ever built? Was 1Hz ever achieved commercially? Fun stuff for Friday! Dan On 3/17/2017 12:00 PM, time-nuts-request@febo.com wrote: > Message: 8 > Date: Fri, 17 Mar 2017 01:34:39 +0100 (CET) > From: "iovane@inwind.it" <iovane@inwind.it> > To: Discussion of precise time and frequency measurement > <time-nuts@febo.com> > Subject: Re: [time-nuts] Antique precision timing device without > electronics > Message-ID: > <1660573894.5853221489710879161.JavaMail.httpd@webmail-13.iol.local> > Content-Type: text/plain;charset="UTF-8" > > This is mine, used to calibrate some aircraft related equipment: > > https://www.flickr.com/photos/103726899@N08/33326340242/in/dateposted-public/ > > and its diagram: > > https://www.flickr.com/photos/103726899@N08/33482556075/in/dateposted-public/ > > iov

-------- In message <338b9eed-8664-3876-afdf-610abc420dd3@irtelemetrics.com>, Dan Kemppainen writes: >What the lowest frequency tuning fork oscillator ever built? Was 1Hz >ever achieved commercially? Does flagpoles count ? :-) -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

Professor Dr. Rohde of Rohde %Schwarz designed in the 1940-es one tuning fork oscillator for 400Hz which was to one crystal phase locked. The company built many exemplars from it. I have seen one working unit in 1967. 73 KJ6UHN On 3/17/2017 1:14 PM, Dan Kemppainen wrote: > This is all cool stuff, and neat to read about. > > What's the best (Most stable, most accurate, best adev, etc.) tuning > fork oscillator made? > > What the lowest frequency tuning fork oscillator ever built? Was 1Hz > ever achieved commercially? > > Fun stuff for Friday! > > Dan > > > > On 3/17/2017 12:00 PM, time-nuts-request@febo.com wrote: >> Message: 8 >> Date: Fri, 17 Mar 2017 01:34:39 +0100 (CET) >> From: "iovane@inwind.it" <iovane@inwind.it> >> To: Discussion of precise time and frequency measurement >> <time-nuts@febo.com> >> Subject: Re: [time-nuts] Antique precision timing device without >> electronics >> Message-ID: >> <1660573894.5853221489710879161.JavaMail.httpd@webmail-13.iol.local> >> Content-Type: text/plain;charset="UTF-8" >> >> This is mine, used to calibrate some aircraft related equipment: >> >> https://www.flickr.com/photos/103726899@N08/33326340242/in/dateposted-public/ >> >> >> and its diagram: >> >> https://www.flickr.com/photos/103726899@N08/33482556075/in/dateposted-public/ >> >> >> iov > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.