[time-nuts] Leap Second Pending
My Thunderbolts have just raised the "Leapsecond Pending" minor alarm... six months seems a bit early for such a warning... _ Stay in touch when you're away with Windows Live Messenger. http://www.windowslive.com/messenger/overview.html?ocid=TXT_TAGLM_WL_messenger2_072008 ___ 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] Leap Second Pending
And my clepsydra is now indicating "Leak Second Pending"... _ With Windows Live for mobile, your contacts travel with you. http://www.windowslive.com/mobile/overview.html?ocid=TXT_TAGLM_WL_mobile_072008 ___ 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] Leap Second Pending
So has mine. Ken, WA2LBI On Mon, Jul 28, 2008 at 8:01 PM, Mark Sims <[EMAIL PROTECTED]> wrote: > > My Thunderbolts have just raised the "Leapsecond Pending" minor alarm... > six months seems a bit early for such a warning... > > ___ 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] Leap Second Pending
Same here, both T-Bolts have Leap Second Flags=Yellow Had, K7MLR At 05:05 PM 7/28/2008, you wrote: >So has mine. > >Ken, WA2LBI > >On Mon, Jul 28, 2008 at 8:01 PM, Mark Sims <[EMAIL PROTECTED]> wrote: > > > > > My Thunderbolts have just raised the "Leapsecond Pending" minor alarm... > > six months seems a bit early for such a warning... > > > > >___ >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] Leap Second Pending
In message <[EMAIL PROTECTED]>, Mark Sims writes: >My Thunderbolts have just raised the "Leapsecond Pending" minor >alarm... six months seems a bit early for such a warning... Yup, got it on my oncore as well: NTPns > show oncore 0 serial port = /dev/cuad5 state = 12 visible/track/lock = 11/8/0 dop = 0.0 [m] 2008-07-29 00:31:29.000744307 Leap second info: 2009-01-01 00:00:00 INSERT 13476511 seconds (155 days) from now [...] -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. ___ 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] Leap Second Pending
Same here. Joe -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Had Sent: Monday, July 28, 2008 7:18 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Leap Second Pending Same here, both T-Bolts have Leap Second Flags=Yellow Had, K7MLR At 05:05 PM 7/28/2008, you wrote: >So has mine. > >Ken, WA2LBI > >On Mon, Jul 28, 2008 at 8:01 PM, Mark Sims <[EMAIL PROTECTED]> wrote: > > > > > My Thunderbolts have just raised the "Leapsecond Pending" minor alarm... > > six months seems a bit early for such a warning... > > > > >___ >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] Leap Second Pending
J. L. Trantham wrote: > Same here. Yes, seems that it's pending in the UK as well. ;-) Dave (G0DJA) ___ 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] Leap Second Pending
Guys, This is typical. The Air Force inserts this flag into the almanac well before the actual event (normally about 6 months) to allow users to prepare for it. Randy Warner -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of David Ackrill Sent: Tuesday, July 29, 2008 2:23 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Leap Second Pending J. L. Trantham wrote: > Same here. Yes, seems that it's pending in the UK as well. ;-) Dave (G0DJA) ___ 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] Leap Second Pending
In message: <[EMAIL PROTECTED]> "randy warner" <[EMAIL PROTECTED]> writes: : This is typical. The Air Force inserts this flag into the almanac well : before the actual event (normally about 6 months) to allow users to prepare : for it. Yes. All the old clocks that stuttered and did the leap second at the 'alternative date' have updated their firmware to not do that anymore... Although the standard says any month, it also says that June/December are primary, with March/September being secondary. I believe it was the Oscilloquartz GPS disciplined clock that did this for sure, and has been reported here. It would be nice if there were more than 6 months of notice for these things, but I don't want to get into that whole debate again here... Warner ___ 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] Leap Second Pending
Mark Sims wrote: > And my clepsydra is now indicating "Leak Second Pending"... > > > > Did you make a typo... or is clepsydra a real word? :-) (just joking) ___ 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] Leap Second Pending
According to Donald DeCarle's Watch and Clock Encyclopedia: Clepsydra- Water Clock. There are various types of water clocks, from the plain vessel with an orifice at its base through which water percolates and, by the lowering of the surface of the water the passage of time is denoted, to the water clock with a mechanical device to cause a hand to rotate. The mechanical clepsydra shown overleaf is simple in operation. The cylindrical vessel is slowly filled with water and a float with a stem and rack engages the wheel to which the hour hand is attached. As the vessel fills so the float rises and the hour hand is made to rotate. When the vessel is full it is emtied (sic) and the process starts over again. While this type of clock is spectacular and one would like to think it is of ancient origin, it has to be recorded that no ancient example has been handed down to us. On the other hand, Egyptian water clocks, as illustrated, have been found and date from about 1400B.C. Primitive water clocks of Saxon times have been found in the British Isles. They are of the "sinking bowl" type, where a bronze bowl with a hole in the bottom was placed upon the surface of the water, water percolated through the hole and eventually it sank which denoted a period of time. It is interesting to note that this system is still used in Algeria for timing periods of the supply of water for irrigation purposes. -Chuck Harris Rex wrote: > Mark Sims wrote: >> And my clepsydra is now indicating "Leak Second Pending"... >> >> >> >> > > Did you make a typo... or is clepsydra a real word? > > > :-) (just joking) > > > ___ > 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] Leap Second Pending
Oh. I see! It was already a joke that I didn't get. Thanks. Chuck Harris wrote: > According to Donald DeCarle's Watch and Clock Encyclopedia: > > Clepsydra- Water Clock. There are various types of water > clocks, from the plain vessel with an orifice at its base through > which water percolates and, by the lowering of the surface > of the water the passage of time is denoted, to the water clock > with a mechanical device to cause a hand to rotate. The mechanical > clepsydra shown overleaf is simple in operation. The cylindrical > vessel is slowly filled with water and a float with a stem and rack > engages the wheel to which the hour hand is attached. As the vessel > fills so the float rises and the hour hand is made to rotate. When > the vessel is full it is emtied (sic) and the process starts over > again. While this type of clock is spectacular and one would like > to think it is of ancient origin, it has to be recorded that no > ancient example has been handed down to us. On the other hand, > Egyptian water clocks, as illustrated, have been found and date from > about 1400B.C. Primitive water clocks of Saxon times have been > found in the British Isles. They are of the "sinking bowl" type, > where a bronze bowl with a hole in the bottom was placed upon the > surface of the water, water percolated through the hole and > eventually it sank which denoted a period of time. It is > interesting to note that this system is still used in Algeria for > timing periods of the supply of water for irrigation purposes. > > -Chuck Harris > > Rex wrote: > >> Mark Sims wrote: >> >>> And my clepsydra is now indicating "Leak Second Pending"... >>> >>> >>> >>> >>> >> Did you make a typo... or is clepsydra a real word? >> >> >> :-) (just joking) >> >> >> ___ >> 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] Leap Second Pending
Quoting Chuck Harris <[EMAIL PROTECTED]>, on Tue 29 Jul 2008 07:05:10 PM PDT: > According to Donald DeCarle's Watch and Clock Encyclopedia: > > Clepsydra- Water Clock. There are various types of water > I should note that because the flow is a function of the viscosity of the working fluid, the clepsydra has a very nonlinear temperature coefficient (with a saturation at around 0C and another saturation at around 100C, if the working fluid is water, depending on the atmospheric pressure) although this can be compensated to a certain extent by changing fluids.. Is a clepsydra using, say, alcohol or fluorinert(tm) still a clepsydra? I wonder if one could make a temperature compensated one (where the orifice size changes with temperature.. much like building a temperature compensated pendulum using metals with two different CTE) There are various forms with tipping bucket (like rain gages) that one might be able to make a calendar with (raising the prospect of actually having a leak second) ___ 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] Leap Second Pending
Very interesting thread. I have been following half distractedly the thread on leap second, while working on the firmware for my GPS Monitor. I am at version 0.1.2, and the second line of the display is now used to display RX Mode, Disciplining Mode, Temperature or DAC Voltage in succession, by pressing a push button. I am using my second prototype for that, the first prototype is still connected to the other TB. This is working, then I glanced at the first prototype, running firmware 0.0.9, and it was alternating between "Normal" and "Leap Second Pending" . V0.0.9 is designed to alternate between the mode and warning flags when any is present. I had not been able to test that feature, because my Thunderbolts are all stabilized, surveyed and so forth. Well, I know now that works too :-) Unfortunately, v0.1.2 at the moment does not display flags at all :-( I have to decide what to do with the flags, I don't want to be displaying "Leap Second Pending" for 6 months, yet other flags may be important to display (like antenna disconnected or shorted). Didier KO4BB ___ 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] Leap Second Pending
The mechanical > clepsydra shown overleaf is simple in operation. The cylindrical > vessel is slowly filled with water and a float with a stem and rack > engages the wheel to which the hour hand is attached. As the vessel > fills so the float rises and the hour hand is made to rotate. When > the vessel is full it is emtied (sic) and the process starts over > again. While this type of clock is spectacular and one would like > to think it is of ancient origin, it has to be recorded that no > ancient example has been handed down to us. Actually, if I'm visualizing this correctly, a similar design was built by the ancient Greeks. I recall a article in National Geographic about the "Tower of the Winds" (or similar). The source of the water stream was a tank that constantly overflowed, maintaining constant water pressure. There was little to go on as far as actual physical evidence, so maybe it was wishful thinking and has been debunked since? -Dave ___ 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] Leap Second Pending
[EMAIL PROTECTED] wrote: > The mechanical >> clepsydra shown overleaf is simple in operation. The cylindrical vessel is >> slowly filled with water and a float >> with a stem and rack engages the wheel to which the hour hand is attached. >> As the vessel fills so the float rises >> and the hour hand is made to rotate. When the vessel is full it is emtied >> (sic) and the process starts over again. >> While this type of clock is spectacular and one would like to think it is of >> ancient origin, it has to be recorded >> that no ancient example has been handed down to us. > > Actually, if I'm visualizing this correctly, a similar design was built by > the ancient Greeks. I recall a article in > National Geographic about the "Tower of the Winds" (or similar). The source > of the water stream was a tank that > constantly overflowed, maintaining constant water pressure. There was little > to go on as far as actual physical > evidence, so maybe it was wishful thinking and has been debunked since? DeCarle was an old guy in the 1960's. What he is referring to is a picture in the encyclopedia of a clock that has a float attached to a rack that drives a pinion attached to an hour hand. The water is directed into the tank, and as the tank fills, the hour hand rotates indicating the time. When the tank is full, a valve is tripped letting the water out of the tank, and the cycle repeats. He acknowledges that there were clepsydra's used in ancient cultures, just not one as cool as the one shown in the picture. > > -Dave ___ 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.
