Re: [time-nuts] How did they distribute time in the old days?
Hi, Brooke, My self winding clock synchronizes fine on three volts. I built a synchronizer using a PIC controller with a 32KHz quartz crystal, running on three volts. You might want to carefully check the coil and connections on yours. By the way, the winding coils also are running on three volts. Don Couch On 10/14/2015 11:02 AM, Brooke Clarke wrote: Hi Nick: One of my Self Winding Clock Co. (WU) clocks was taken down yesterday for painting. When put up one of the Ken's Clock Synchronizers was installed and the hands moved to align with the heart shaped cam it uses, but it never worked. The problem was it used a 4.5 Volt signal which can develop the current needed to pull the sync electromagnet the time constant is far too slow. I'm going to add a high voltage circuit with series resistor to get the time constant down one or two orders of magnitude. The key to this is a PCB I make that holds 5 each 9V batteries connected in series, so I'll use one, two or more of them to get the time constant down. http://www.prc68.com/P/45VS.html Before I had the 45 Volt Stick I was considering getting the needed high voltage by charging a cap a minute or two before the top of the hour and discharging it through a resistor. Here's a video showing that would work. http://www.prc68.com/I/SWCC.shtml#Experiments_Feb_2014_ Mail_Attachment -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html http://www.prc68.com/I/DietNutrition.html Nick Sayer via time-nuts wrote: On Oct 14, 2015, at 4:42 AM, billriches <bill.ric...@verizon.net> wrote: Not milisecond time distribution but time related! In the early half of the 1900s Western Union was in the time business. They would rent businesses such as banks, office buildings, etc clocks for a few dollars a month. These were pendulum wall clocks that had 2 #6 dry cell batteries inside that would wind them every hour or so. The clocks were connected to the WU telegraph line and for a minute before and after the top of the hour all traffic on the circuit would stop. Exactly at the top of the hour they would push a pulse of 50 ? volts or so over the line and it would reset the clock to the top of the hour. The WU standard time service goes back further than the turn of the 20th century. It started in 1870. I’ve always wanted to get my hands on one of those clocks and come up with a circuit to recreate the synchronization signal for it, probably with a Raspberry Pi running ntpd and a big ol’ MOSFET. The problem is that at this point, those clocks are quite expensive once they’re reconditioned. My understanding (perhaps incorrect) was that the sync pulse was once daily and, as you said, would cause the hands to “snap” to 12. The trailing edge of the pulse was synchronized and would release the clock to operate normally. That they had something as accurate and widespread as it was so early is astonishing. ___ 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] time-nuts Digest, Vol 89, Issue 51
The idea that conversion to metric would require replacing all of the machine tools (lathes, mills, etc) is a myth. Any U.S. machine shop has walls and toolboxes covered in conversion charts, converting drill, screw, wire, sheet sizes from one crazy measurement to another. One single additonal conversion chart, inch to metric, and you can keep using your inch machines on metric projects. My mill has inch lead screws. I added a low cost digital readout with a little button to show inch or millimeter movements, and now I do everything in metric. No problem. Don Couch --- On Thu, 12/15/11, Dan Kemppainen d...@irtelemetrics.com wrote: From: Dan Kemppainen d...@irtelemetrics.com Subject: Re: [time-nuts] time-nuts Digest, Vol 89, Issue 51 To: time-nuts@febo.com Date: Thursday, December 15, 2011, 10:29 AM On 12/14/2011 3:59 PM, time-nuts-requ...@febo.com wrote: It's not like metric is totally absent. We drink 2 liter cokes and defend ourselves with 9mm pistols. Our cars use mostly metric parts. Even ham radio operators, arguably the most jingoistic and set in the past bunch around, get on the 80, 40, and 20 METER bands. I agree with you, and funnily enough the rest of the NATO world uses 7.62mm and 5.56mm rifles. (Both were originally based on standard inch sized rifle cartridges designed in the US) The problem in converting to metric would require replacing a lot of tools. For example Mills, lathes, and other machining tools and measurement devices are expensive, and last for decades. I doubt many of the small tool shops around here could afford it.It's a great idea to standardize in theory, but in practice it becomes difficult. Maybe the whole world should standardize our language. We could all switch to Spanish or Latin or Chinese to speak with so we could all talk with each other. That would probably be more helpful to me on a daily basis, than having to switch measurement systems. While we're on the subject, let me throw time back into the mix. We use months and days for scheduling projects. Meanwhile some of our counterparts use calendar weeks. This is much more difficult to convert between than inch and mm. When is CW 36??? There I threw some wood on the fire too! Dan ___ 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] metric / English
Hi, Brooke, To cut metric threads on an inch machine, I mesh the 127 tooth gear with the 100 tooth gear that came with my Sherline lathe threading attachment. Works great. Don Couch --- On Fri, 12/16/11, Brooke Clarke bro...@pacific.net wrote: From: Brooke Clarke bro...@pacific.net Subject: Re: [time-nuts] metric / English To: Discussion of precise time and frequency measurement time-nuts@febo.com Date: Friday, December 16, 2011, 9:48 AM Hi Don: Sure converting lengths is easy and I have metric, English and weird taps and dies, but how do you turn metric threads? Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/Brooke4Congress.html Don Couch wrote: The idea that conversion to metric would require replacing all of the machine tools (lathes, mills, etc) is a myth. Any U.S. machine shop has walls and toolboxes covered in conversion charts, converting drill, screw, wire, sheet sizes from one crazy measurement to another. One single additonal conversion chart, inch to metric, and you can keep using your inch machines on metric projects. My mill has inch lead screws. I added a low cost digital readout with a little button to show inch or millimeter movements, and now I do everything in metric. No problem. Don Couch --- On Thu, 12/15/11, Dan Kemppainend...@irtelemetrics.com wrote: From: Dan Kemppainend...@irtelemetrics.com Subject: Re: [time-nuts] time-nuts Digest, Vol 89, Issue 51 To: time-nuts@febo.com Date: Thursday, December 15, 2011, 10:29 AM On 12/14/2011 3:59 PM, time-nuts-requ...@febo.com wrote: It's not like metric is totally absent. We drink 2 liter cokes and defend ourselves with 9mm pistols. Our cars use mostly metric parts. Even ham radio operators, arguably the most jingoistic and set in the past bunch around, get on the 80, 40, and 20 METER bands. I agree with you, and funnily enough the rest of the NATO world uses 7.62mm and 5.56mm rifles. (Both were originally based on standard inch sized rifle cartridges designed in the US) The problem in converting to metric would require replacing a lot of tools. For example Mills, lathes, and other machining tools and measurement devices are expensive, and last for decades. I doubt many of the small tool shops around here could afford it.It's a great idea to standardize in theory, but in practice it becomes difficult. Maybe the whole world should standardize our language. We could all switch to Spanish or Latin or Chinese to speak with so we could all talk with each other. That would probably be more helpful to me on a daily basis, than having to switch measurement systems. While we're on the subject, let me throw time back into the mix. We use months and days for scheduling projects. Meanwhile some of our counterparts use calendar weeks. This is much more difficult to convert between than inch and mm. When is CW 36??? There I threw some wood on the fire too! Dan ___ 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. ___ 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] IBM TYpe 37 Master was Re: IBM's Clock Corner
Hi, Russell, I just recently sold my IBM Type 37 to a collector in the Los Angeles area. I have the factory documentation for it. If you send me your snail mail address, I will run off a copy for you. This is indeed a fabulous clock. Mine was built in 1957. It used the 3-minute 600Hz. tone that WWV used to send to synchronize itself every hour. The 3-minute tone was validated by using a rotating cam switch driven by a separate synchronous motor. WWV changed its broadcast format a few years later to send one-minute tones instead of 3 minute. There is one of these on display in the lobby of the NIST labs in Boulder, Colorado. email me at couchclocks at yahoo dot com (make the obvious changes in the email address). Don Couch --- On Fri, 7/1/11, Russell Rezaian rreza...@motorola.com wrote: From: Russell Rezaian rreza...@motorola.com Subject: Re: [time-nuts] IBM TYpe 37 Master was Re: IBM's Clock Corner To: Discussion of precise time and frequency measurement time-nuts@febo.com Date: Friday, July 1, 2011, 1:08 PM Hi Pete, Thanks. Yes, I was planning to write them myself. The existence and quality of the Clock Corner site itself is pretty strong evidence that they take this sort of request very seriously... Incidentally, if you search for the Typer 37 master in the world's favorite search engine there's a link to NIST document that has a picture of a Type 37 which is supposed to be on display in Boulder somewhere :) Mine doesn't look quite as nice (it needs a little TLC) but these are very interesting clocks... More Atomic Era than atomic though. -- Russell At 12:52 PM -0700 2011/07/01, Pete Lancashire wrote: I would give a try at contacting IBM's Archivist. Who ever wrote the Clock page came across as very dedicated to his or her job. -pete On Fri, Jul 1, 2011 at 12:45 PM, Russell Rezaian rreza...@motorola.com wrote: I've actually had reason to reference this IBM resource myself recently. Unfortunately they don't have much in the way of detail on the Type 37 Master. ___ 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] HP E1938 oscillator
Hi, Rick. If you have any left, I would like one. Please let me know how you want paid (cash, money order, paypal, ...) Don Couch 3336 E. Oraibi Drive Phoenix, Arizona 85050 [EMAIL PROTECTED] Richard (Rick) Karlquist [EMAIL PROTECTED] wrote: I still have dozens of surplus E1938A's if anyone wants one. They are in worked the last time it was turned on, but no guarantee of specs condition. I can't accept money for these units. Rick Karlquist N6RK E1938A circuit designer Due to the high level of interest, I may need to limit the oscillators to one per person. I will be getting the oscillators out of storage today and will try to make an accounting of oscillators vs requestors. I am suggesting an $8.95 donation for a flat rate Priority Mail box. I think it will fit into one of those boxes. Regarding non-USA requestors: I will need to look into the customs aspect of this. If anyone on the list can give me a tutorial on this it would be helpful. These are gifts if that matters for customs purposes. Also, they have essentially zero market value as discards. I am happy that I can give these a good home. I almost threw them away last month while cleaning up. Rick Karlquist ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts - Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail, news, photos more. ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
