Utilized in early mechanical clocks and later introduced into pocket watches in the mid seventeenth century , the chain and fusee was the first significant mechanism to improve isochronism .
https://quillandpad.com/2018/11/21/the- ... -gauthier/
The Fusee And Chain - From Function To Fashion
- tempusmaximus
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Re: The Fusee And Chain - From Function To Fashion
Looks like a Shimano gear train, judging by the gold, next level above XTR.
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Re: The Fusee And Chain - From Function To Fashion
Interesting article. By my understanding the issue of isochronism must explain why the SH21 5 day movement operates to COSC as long as it has more than 2 days power reserve left, thereafter accuracy is a smidgeon less.
Patrick
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C60 Pro 300, C60 Sunrise, C63 Sealander Lucerne blue LE, C65 Dartmouth, W11 Amelia (wife), C63 Sealander (son)
Some others + a few on the way
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