Re: [time-nuts] Clock Powers of Ten
So you put a sensor on the neck of the hourglass, and rotate it whenever the sand stops falling. You'd have to adjust the sand to make up for the rotation time, and to further calibrate it... -Dave -- Original message -- From: Bruce Griffiths [EMAIL PROTECTED] Brooke Clarke wrote: Hi Tom: Nice overview. I think in your Powers of Ten you showed a timepiece for which I don't remember any data. Since it's shown on the last page does that mean the hour glass has very good specs? How can it have (as a clock)? It isnt a periodic device by itself. Need to turn it into an oscillator/periodic device first before AVAR etc, can be measured. Bruce ___ 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. ___ 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.
Re: [time-nuts] Clock Powers of Ten
[EMAIL PROTECTED] wrote: So you put a sensor on the neck of the hourglass, and rotate it whenever the sand stops falling. You'd have to adjust the sand to make up for the rotation time, and to further calibrate it... -Dave - That would certainly be an interesting experiment. Should be followed by measuring AVAR for a Clepshydra. Bruce ___ 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.
Re: [time-nuts] Clock Powers of Ten
the caseit is probably enshrined in law in the UK. Also Our nominal voltage is 240v not the 230v decreed by the EU fortunately we According to the Electricity Supply (Amendment) (No. 2) Regulations 1994 (Statutory Instrument 1994 No. 3021) at http://www.opsi.gov.uk/si/si1994/Uksi_19943021_en_1.htm '4.In paragraph (1) of regulation 30 (declaration of phases, frequency and voltage at supply terminals) for the words 240 volts there shall be substituted the words 230 volts.' Chris G3RSE ___ 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.
Re: [time-nuts] Clock Powers of Ten
Fun! What piece of equipment is that Isotemp OCXO (page 28) used in? Scott, it's from a Trak 8812 GPS Station Clock (an early GPSDO). I must say the drip clock was very nice. Re the mains frequency, I believe it changes with the load on the grid. Do you have a record of this? Sylvain, see: http://www.leapsecond.com/pages/mains/ Very nice, it reminded me of a NYT article about a year ago that describes the long zoom as one of the defining aspects of this generation: Jeff, thanks for the pointer to that one. I think in your Powers of Ten you showed a timepiece for which I don't remember any data. Since it's shown on the last page does that mean the hour glass has very good specs? Brooke, I did take time interval data on the hour glass but it was too awkward to manually get enough for a nice adev plot so I left it out of the talk. I also checked its tempco (room temperature vs. running in the 'fridge). What I need is someone to build an optically sensed auto-flipper for an hourglass. Then not only could a PC collect interval data unattended, but I'd get about 24 clean samples per day, for weeks or months at a time. I suspect a frequency drift would show up if left running long enough. /tvb ___ 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.
Re: [time-nuts] Clock Powers of Ten
Tom, for your archive of tuning fork oscillators pictures, look at my Bryans Aeroquipment (later a Negretti Zambra division) 50 Hz fork at http://xoomer.alice.it/iovane and click on fork.htm - This appeared to be quite stable. Antonio ___ 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.
[time-nuts] Clock Powers of Ten
There are good clocks and bad clocks. Most need power, one needs food, another runs all by itself. Take a trip across 15 orders of magnitude of clock performance: http://www.leapsecond.com/ten/ /tvb ___ 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.
Re: [time-nuts] Clock Powers of Ten
At 03:55 PM 1/31/2008, Tom Van Baak wrote: Take a trip across 15 orders of magnitude of clock performance: http://www.leapsecond.com/ten/ Fun! What piece of equipment is that Isotemp OCXO (page 28) used in? -- newell N5TNL ___ 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.
Re: [time-nuts] Clock Powers of Ten
Tom Van Baak wrote: There are good clocks and bad clocks. Most need power, one needs food, another runs all by itself. Take a trip across 15 orders of magnitude of clock performance: http://www.leapsecond.com/ten/ /tvb I must say the drip clock was very nice. Re the mains frequency, I believe it changes with the load on the grid. Do you have a record of this? Sylvain ___ 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.
Re: [time-nuts] Clock Powers of Ten
There are good clocks and bad clocks. Most need power, one needs food, another runs all by itself. Take a trip across 15 orders of magnitude of clock performance: Excellent stuff Tom! Best Rgds Rob K ___ 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.
Re: [time-nuts] Clock Powers of Ten
Very cool, Tom! John Tom Van Baak said the following on 01/31/2008 04:55 PM: There are good clocks and bad clocks. Most need power, one needs food, another runs all by itself. Take a trip across 15 orders of magnitude of clock performance: http://www.leapsecond.com/ten/ /tvb ___ 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. ___ 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.
Re: [time-nuts] Clock Powers of Ten
Very nice, it reminded me of a NYT article about a year ago that describes the long zoom as one of the defining aspects of this generation: http://www.nytimes.com/2006/10/08/magazine/08games.html?ei=5090en=d551133c9414ebbdex=131796partner=rssuserlandemc=rsspagewanted=all jeff John Ackermann N8UR wrote: Very cool, Tom! John Tom Van Baak said the following on 01/31/2008 04:55 PM: There are good clocks and bad clocks. Most need power, one needs food, another runs all by itself. Take a trip across 15 orders of magnitude of clock performance: http://www.leapsecond.com/ten/ /tvb ___ 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. ___ 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. ___ 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.
Re: [time-nuts] Clock Powers of Ten
On Jan 31, 2008 5:27 PM, Sylvain RICHARD [EMAIL PROTECTED] wrote: Re the mains frequency, I believe it changes with the load on the grid. Do you have a record of this? I forget the reasoning for frequency variation, but it is load or source related I believe. Part of the reason it A project for a easy to build AC frequency measuring device: http://www.sparetimegizmos.com/Hardware/AC_Monitor.htm I could log the frequency deviations from my local AC mains if you want some sample data. ___ 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.
Re: [time-nuts] Clock Powers of Ten
michael taylor a écrit : On Jan 31, 2008 5:27 PM, Sylvain RICHARD [1][EMAIL PROTECTED] wrote: Re the mains frequency, I believe it changes with the load on the grid. Do you have a record of this? I forget the reasoning for frequency variation, but it is load or source related I believe. Part of the reason it It is a balance between production and grid load. In the European case, the grids are phase synchronous over several countries. The (oldish) data I have is - Nordel : Finland, Norway, Sweden, Denmark - Uktsoa : UK. - Atsoi : Irland - Ucte : everybody else in Western Europe : Portugal, Spain, France, Netherlands, Belgium, Luxembourg, Germany, Switzerland, Austria, Italy, Czech Republic, Slovakia, Poland, Hungary, Romania, ex-Yougoslavia During the 2006 blackout, the frequency went down by several hertz before some customers were disconnected (load shedding). The so familiar 50Hz line on VLF spectrograms took a dip. A project for a easy to build AC frequency measuring device: [2]http://www.sparetimegizmos.com/Hardware/AC_Monitor.htm I could log the frequency deviations from my local AC mains if you want some sample data. This gadget looks nice, but I think I'll pass. Good night Sylvain References 1. mailto:[EMAIL PROTECTED] 2. http://www.sparetimegizmos.com/Hardware/AC_Monitor.htm ___ 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.
Re: [time-nuts] Clock Powers of Ten
Hi, I dont know about other counties but the oad shedding is certainly still dont this way in the UK, BUT the incremental frequency adjectments are corrected for the mean daily frequency to be correvt at 06:00 in the morning so that all the clocks read correctly and we get to work on time!! Despite quartzz clocks I think this is still the caseit is probably enshrined in law in the UK. Also Our nominal voltage is 240v not the 230v decreed by the EU fortunately we can still be fed 240v within the tolarance allows otherwise my toaster would take forever. There is actually a considerable difference in the light output of a tungsten bulb over that range maybe that is why we are being forced into using polluting CFBs...nutting to do with time ...sorry pardon Great site Tom !! Alan G3NYK . - Original Message - From: Sylvain RICHARD [EMAIL PROTECTED] To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Friday, February 01, 2008 12:25 AM Subject: Re: [time-nuts] Clock Powers of Ten michael taylor a écrit : On Jan 31, 2008 5:27 PM, Sylvain RICHARD [1][EMAIL PROTECTED] wrote: Re the mains frequency, I believe it changes with the load on the grid. Do you have a record of this? I forget the reasoning for frequency variation, but it is load or source related I believe. Part of the reason it It is a balance between production and grid load. In the European case, the grids are phase synchronous over several countries. The (oldish) data I have is - Nordel : Finland, Norway, Sweden, Denmark - Uktsoa : UK. - Atsoi : Irland - Ucte : everybody else in Western Europe : Portugal, Spain, France, Netherlands, Belgium, Luxembourg, Germany, Switzerland, Austria, Italy, Czech Republic, Slovakia, Poland, Hungary, Romania, ex-Yougoslavia During the 2006 blackout, the frequency went down by several hertz before some customers were disconnected (load shedding). The so familiar 50Hz line on VLF spectrograms took a dip. A project for a easy to build AC frequency measuring device: [2]http://www.sparetimegizmos.com/Hardware/AC_Monitor.htm I could log the frequency deviations from my local AC mains if you want some sample data. This gadget looks nice, but I think I'll pass. Good night Sylvain References 1. mailto:[EMAIL PROTECTED] 2. http://www.sparetimegizmos.com/Hardware/AC_Monitor.htm ___ 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. ___ 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.
Re: [time-nuts] Clock Powers of Ten
From: Sylvain RICHARD [EMAIL PROTECTED] Subject: Re: [time-nuts] Clock Powers of Ten Date: Fri, 01 Feb 2008 01:25:54 +0100 Message-ID: [EMAIL PROTECTED] michael taylor a écrit : On Jan 31, 2008 5:27 PM, Sylvain RICHARD [1][EMAIL PROTECTED] wrote: Re the mains frequency, I believe it changes with the load on the grid. Do you have a record of this? I forget the reasoning for frequency variation, but it is load or source related I believe. Part of the reason it Over-production compared to consumption raises the frequency. Under-production compared to consumption lowers the frequency. To balance the frequency, the production of electricity is raised or lowered as required. In addition, the reactive effect is balanced. During failures, creating lower consumption converts under-production to over-production and thus raises the frequency again. There was once a good posting on this on Synth-DIY upon my request. Can't find it by quick google attacks. Cheers, Magnus ___ 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.
Re: [time-nuts] Clock Powers of Ten
Hi Tom: Nice overview. Charles and Ray Eames did: Powers of Ten http://www.imdb.com/title/tt0078106/ Toccata for Toy Trains http://www.imdb.com/title/tt0051091/ and the Eames chair which is still available from Herman Miller: http://www.hermanmiller.com/CDA/SSA/Product/1,1592,a10-c440-p47,00.html I think in your Powers of Ten you showed a timepiece for which I don't remember any data. Since it's shown on the last page does that mean the hour glass has very good specs? Have Fun, Brooke Clarke http://www.prc68.com/Alpha.shtml All my web pages listed based on html name http://www.PRC68.com http://www.precisionclock.com http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Web Cam Tom Van Baak wrote: There are good clocks and bad clocks. Most need power, one needs food, another runs all by itself. Take a trip across 15 orders of magnitude of clock performance: http://www.leapsecond.com/ten/ /tvb ___ 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. ___ 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.
Re: [time-nuts] Clock Powers of Ten
Brooke Clarke wrote: Hi Tom: Nice overview. I think in your Powers of Ten you showed a timepiece for which I don't remember any data. Since it's shown on the last page does that mean the hour glass has very good specs? How can it have (as a clock)? It isnt a periodic device by itself. Need to turn it into an oscillator/periodic device first before AVAR etc, can be measured. Bruce ___ 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.
