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Atomic Clocks

nist.gov

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Re: Atomic Clocks

#21

Post by chickensong »

tomcam wrote: post #15

Long before most of you were born there was a special number you could call to get the time here in the USA. It would give you a localized time every 10 seconds. It was considered an authoritative value, but I knew that normal analog clocks drifted a fair amount, and I was fascinated by the Time voice. There was also a special number to dial that was called Information. When I was about 12, I suddenly thought that’s…

In Northern California the number corresponded to POP-CORN, so if you wanted to know the time you called popcorn, and got a lovely lady's voice: "At the tone, the time will be...". The POP prefix was a shortcut to the phone company.

Re: Atomic Clocks

#22

Post by ButlerianJihad »

chickensong wrote: post #21
tomcam wrote: post #15

Long before most of you were born there was a special number you could call to get the time here in the USA. It would give you a localized time every 10 seconds. It was considered an authoritative value, but I knew that normal analog clocks drifted a fair amount, and I was fascinated by the Time voice. There was also a special number to dial that was called Information. When I was about 12, I suddenly thought that’s…

In Northern California the number corresponded to POP-CORN, so if you wanted to know the time you called popcorn, and got a lovely lady's voice: "At the tone, the time will be...". The POP prefix was a shortcut to the phone company.

https://en.wikipedia.org/wiki/Point_of_presence

https://en.wikipedia.org/wiki/Telephone_exchange_names#Stand...

  76x-nnnn: POplar, POrter, ROckwell, ROger(s), SOuth(field)
411 Directory Assistance in 1978 https://youtu.be/UpsGpZ7wi9k?si=gSKP2K7WGPn-cbBj&t=60

Re: Atomic Clocks

#23

Post by globular-toast »

tomcam wrote: post #15

Long before most of you were born there was a special number you could call to get the time here in the USA. It would give you a localized time every 10 seconds. It was considered an authoritative value, but I knew that normal analog clocks drifted a fair amount, and I was fascinated by the Time voice. There was also a special number to dial that was called Information. When I was about 12, I suddenly thought that’s…

That's brilliant. Sometimes talking to real humans is great.

It reminds me of two things. When I was a child I was given a postage stamp and wrote a letter to "Wallace and Gromit Ltd" and posted it. Remarkably, I got a reply from Aardman Animations with a card signed by Nick Park himself. Someone at Royal Mail obviously understood and looked up the real address of the studio.

Later as a teen I noticed the clock on our oven displayed "24:00" at midnight instead of the more conventional "0:00"[0]. I wrote to the manufacturer (Neff) on a support channel and it actually got forwarded through several departments before I received a reply from an engineer quoting ISO8601 and how it doesn't actually specify that midnight has to be 0:00 (although, sadly, I never received a positive reason for why someone made the oven clock like this).

For those of us who remember such interactions it's even more frustrating when you find there's a dumb robot at the end of the line. Even if it's LLM powered. I actually asked ChatGPT what it would do with the Wallace and Gromit letter and it couldn't find the same solution. We lost a lot with Google-style faceless companies.

As for the time, in the UK we had (have?) "The Talking Clock" which you could get to by dialling 123. This was well enough known in 2001 to be a key part of this scene from The Office: https://www.youtube.com/watch?v=SdBCFV6qa3A&t=146

[0] I just looked this up again and, funnily enough, John Ward showed a similar oven on his YouTube channel: https://www.youtube.com/watch?v=4_oLT7lWQ44

Re: Atomic Clocks

#24

Post by matwood »

tomcam wrote: post #15

Long before most of you were born there was a special number you could call to get the time here in the USA. It would give you a localized time every 10 seconds. It was considered an authoritative value, but I knew that normal analog clocks drifted a fair amount, and I was fascinated by the Time voice. There was also a special number to dial that was called Information. When I was about 12, I suddenly thought that’s…

For the kids out there, calling a number for recorded information was common in the 90s I guess? Movie times was a big one. Where I was locally, multiple surf shops did 3-4x daily surf reports. The later was a bit funny because if one of the usual update times was missed you knew the waves were good and the guy was surfing :)

Re: Atomic Clocks

#25

Post by tialaramex »

hackingonempty wrote: post #3
LeoPanthera wrote: post #2

Fun fact, two (very expensive) wristwatches have actual atomic timekeeping in them, instead of just receiving a radio time signal: the Bathys Hawaii Cesium 133, and a few different shaped from Hoptroff London. All released 2013-2015. Not sure what happened then for there to be suddenly two.

Symmetricom (now owned by Microchip) released the first Chip Scale Atomic Clocks in 2011. It probably took some time for them to become available to watch designers and for them to be integrated into watch designs. https://www.nist.gov/noac/success-story-chip-scale-atomic-cl... I'm guessing the watches sold poorly and the chip packages are still large compared to a watch movement, so no new designs.

Yeah, likewise the Breitling Emergency is big because it's an actual working 406 MHz Personal Locator Beacon. In principle that's all you need to have a rescue team come get you if you, I dunno, crashed your plane on a desert island or you broke your leg while hiking in Siberia, or whatever. Of course if you're the sort of person who wears a wristwatch which costs as much as a car you probably aren't doing anything like that, but you could be and maybe you're an elite solo who "travels light" and so you couldn't pack a conventional much cheaper PLB.

I can't imagine Breitling sells very many of these, they're huge heavy watches, if you're The Rock they probably look fine on your arm but the average tough guy can't justify owning a watch this expensive and if you're the 5'4" female CEO of a famous company you can afford the Emergency but it looks ridiculous and feels like you're carring a boulder on your wrist.

Like Concorde, sometimes we prove something was possible but it turns out it was unavoidably too expensive and annoying for it to make much sense in the market.

[Edit: Fix spelling of Concorde]

Re: Atomic Clocks

#26

Post by quailfarmer »

geerlingguy wrote: post #5
hackingonempty wrote: post #3

Earlier quoted context omitted.

Symmetricom (now owned by Microchip) released the first Chip Scale Atomic Clocks in 2011. It probably took some time for them to become available to watch designers and for them to be integrated into watch designs. https://www.nist.gov/noac/success-story-chip-scale-atomic-cl... I'm guessing the watches sold poorly and the chip packages are still large compared to a watch movement, so no new designs.

Sadly, no major miniaturization breakthroughs since. And those CSACs still eat up a lot of power (as do good OCXOs), making them rough for battery powered wearables.

MEMS! You should get in touch with the folks at SiTime.

Re: Atomic Clocks

#27

Post by chickensong »

matwood wrote: post #24
tomcam wrote: post #15

Long before most of you were born there was a special number you could call to get the time here in the USA. It would give you a localized time every 10 seconds. It was considered an authoritative value, but I knew that normal analog clocks drifted a fair amount, and I was fascinated by the Time voice. There was also a special number to dial that was called Information. When I was about 12, I suddenly thought that’s…

For the kids out there, calling a number for recorded information was common in the 90s I guess? Movie times was a big one. Where I was locally, multiple surf shops did 3-4x daily surf reports. The later was a bit funny because if one of the usual update times was missed you knew the waves were good and the guy was surfing :)

777-FILM "Hello, and welcome to Moviefone!"

Re: Atomic Clocks

#28

Post by weinzierl »

tomcam wrote: post #15

Long before most of you were born there was a special number you could call to get the time here in the USA. It would give you a localized time every 10 seconds. It was considered an authoritative value, but I knew that normal analog clocks drifted a fair amount, and I was fascinated by the Time voice. There was also a special number to dial that was called Information. When I was about 12, I suddenly thought that’s…

Also, where I live, radio transmitted the precise time in the most low tech way possible. A person said: "It is XX:XX time with the beep" and this was followed by four beeps, three short, one long, with the end of the last beep signifying the exact moment of the announced time.

Re: Atomic Clocks

#29

Post by sakree »

tialaramex wrote: post #25
hackingonempty wrote: post #3

Earlier quoted context omitted.

Symmetricom (now owned by Microchip) released the first Chip Scale Atomic Clocks in 2011. It probably took some time for them to become available to watch designers and for them to be integrated into watch designs. https://www.nist.gov/noac/success-story-chip-scale-atomic-cl... I'm guessing the watches sold poorly and the chip packages are still large compared to a watch movement, so no new designs.

Yeah, likewise the Breitling Emergency is big because it's an actual working 406 MHz Personal Locator Beacon. In principle that's all you need to have a rescue team come get you if you, I dunno, crashed your plane on a desert island or you broke your leg while hiking in Siberia, or whatever. Of course if you're the sort of person who wears a wristwatch which costs as much as a car you probably aren't doing anything l…

you would be surprised how large and passionate the watch community is. In the world of watches that breitling is big, but not really that big. It is quite a popular watch, and not that expensive : https://www.chrono24.com/breitling/emergency--mod21.htm?dose...

Re: Atomic Clocks

#30

Post by d3Xt3r »

weinzierl wrote: post #28
tomcam wrote: post #15

Long before most of you were born there was a special number you could call to get the time here in the USA. It would give you a localized time every 10 seconds. It was considered an authoritative value, but I knew that normal analog clocks drifted a fair amount, and I was fascinated by the Time voice. There was also a special number to dial that was called Information. When I was about 12, I suddenly thought that’s…

Also, where I live, radio transmitted the precise time in the most low tech way possible. A person said: "It is XX:XX time with the beep" and this was followed by four beeps, three short, one long, with the end of the last beep signifying the exact moment of the announced time.

We had a similar beep scheme, except it would play before the next programme stated, typically before the morning/evening news.
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