Not very well at the moment, so I’m passing the time by revisiting some half-remembered pages.
This essay on escapements has been mentioned previously on the forum, but would be difficult to locate by searching.
It is masterly in its clarity, and I recommend book-marking it:
http://www.abbeyclock.com/ttoc.html
MichaelG.
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P.S. __ there is a great deal more of interest on http://www.abbeyclock.com/