History of Watchmaking - Part 4of4 Accuracy
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- เผยแพร่เมื่อ 10 เม.ย. 2021
- Look through the eyes of a watchmaker and share the passion of Kalle Slaap from team Chronoglide!
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Tutorial on the history of watchmaking by watchmaker Kalle Slaap from Chronoglide, Vintage Watch repair specialists near Amsterdam. Join his love for John Harrison and the Marine Chronometer.
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Thank you very much for all this educational content. I wish you every happiness and peace of mind.
Thank you very much for explanations, you really make me happy to understand all this compensations. All the best from my side to you!
Your explanations are sooo good!
That is so kind Ardi!
Grazie!
Brilliant Kalle just love these movements...
So do I John, fantastic stuff!
Awesome video!! Very well explained 👍
epic‼️®™️ 🔥🔥🔥
Had a look at his clocks at Greenwich :)
Respectfully, the pocket watch in John Harrison’s right hand is presumed to be the one made for him by John Jeffreys in 1753.
Reference: Page 150 & 151 of “The Illustrated Longitude” by Dava Sobel and William J. H. Andrewes 1998.
Thank you for this excellent video!
Excellent information, thnx!
You should continue with another video on accuracy showing the accuracy of the different approaches perhaps mechanical to quartz and show the overlap in accuracy and if this accuracy is indeed the estimates you give at 10x better at time keeping for quartz, which based on actual quartz crystal designs even at constant body temperature is really not that impressive.
But, what do we use as a standard interval of one second (atomic clock), and in improving accuracy what are realistic goals for time pieces. This is also a relevant question. Accurate time is necessary and useful but to who and why. The example in the video is for navigation at sea, but who else needs accurate time?
If you want to improve accuracy you have to have an accurate time reference, either from an internal source or an external source (GPS, Radio, Network Time Protocol (NIST NTP), etc. which are usually tied back to an atomic clock reference), or perhaps both, an accurate internal oscillator and then correct it using a more accurate external source. Which is what is normally done as a basic concept.
It gets more interesting however, if you want to correct a very accurate clock, let's say about +/- 127 ppb per year or +/- 4 seconds a year, which is doable with a Temperature (Oven) controlled crystal oscillator, because in order to correct, lets say an error of 1 second, it may take a great deal of time (months) for the 127 ppb time base to accumulate an error of 1 second.
But, the difficulty does not end there, because now you have to devise an algorithm that is able to trend the true referenced time (NTP for example) in such a way as to provide the needed resolution with perhaps a certainty of 1/20 of a second at minimum, and then determine when and how is the correction actually made, over what time span one minute? one hour? one day?
I think the goal (as just one example) of long term internal accuracy of +/- 4 seconds per year over a period of 30 years is just as interesting as the beginning origins of accurate time as shown in your video. In conclusion, perhaps as a watch maker, you are the most qualified to tell your audience the true meaning of time.
Many thanks for share your knowledge. Those videos are gold.
Knowledge share is so important in watchmaking, it's the only way to create the next generation of watchmakers.
A profound statement indeed Kalle.
I wish I could press the like button. Many times! 🙌😊👌
LOL
I really enjoy your programs. I am amazed by the ingenuity of clock and watch makers at the beginning of the industrial revolution. I am a bit confused in regards to the bimetallic balance wheel. As temperature rises most material expands. So a pure steel loop and a pure copper loop would lengthen and the movement will slow down. Because copper lengthens more than steel (alpha Cu=16.7 and alpha steel Fe=11) for the same temperature increase, the bimetallic balance wheel will decrease in diameter because the steel (inner circumference) will lengthen less than the copper (outer circumference), thereby forcing the loop to curve inward and decreasing the diameter. This difference will keep the overall diameter of the balance wheel constant? And the overall movement of the watch constant?
Love this. Would like to see some lathe work someday :)
I'll keep it in mind Richard!
Hello Kalle how is the filming of making a hole smaller coming along regards
I will show it live on Twitch coming tuesday Blenny. That stream will be editted later as a short video. The one i recorded earlier did't contain any theory.
John Harrison the carpenter his grandfather clock with oily timbers still working. Losing so little a month. Then H1 H2 H3 and H4. Wow. Rocket 🚀 science
Truely amazing isn't it? We're standing on the shoulders of giants.