I've had some of these questions for years, but my mind has been wandering while working lately (not alot of challenging stuff).
One question was about Hamiltons use of poised balance spring collets to get closer positional rates, and why it didn't seem to be adopted more? Was it not enough of an improvement? And what watches used them?
I was also thinking about Gibri using weights on the spring itself and from his description of where they were put, it seemed to me that the weights were possibly balancing out the poise of the collet achieving close the same result.
I wonder if Gibri had thought of poising the collet, he may have done that instead of the weights?
Gibri's book was one of my first watchmaking manuals, for anyone else who wants to read the whole book.
Dan
One question was about Hamiltons use of poised balance spring collets to get closer positional rates, and why it didn't seem to be adopted more? Was it not enough of an improvement? And what watches used them?
I was also thinking about Gibri using weights on the spring itself and from his description of where they were put, it seemed to me that the weights were possibly balancing out the poise of the collet achieving close the same result.
I wonder if Gibri had thought of poising the collet, he may have done that instead of the weights?
Gibri's book was one of my first watchmaking manuals, for anyone else who wants to read the whole book.
Practical course in adjusting, comprising a review of the laws governing the motion of the balance and balance spring in watches and chronometers, and application of the principles deduced therefrom in the correction of variations of rate arising from want of isochronism, change of position and variation of temperature .. : Gribi, Theo. (Theophilus) : Free Download, Borrow, and Streaming : Internet Archive
Book digitized by Google from the library of the University of Michigan and uploaded to the Internet Archive by user tpb.
archive.org
Dan