On Sun, 02 Jan 2005 18:29:24 GMT, "David Anderson"
wrote:

Any references for layout and construction of dead beat escapements? I have
Gazeley/Penman/Rawlings/Britten's books etc but they all seem to be located
in the 19th century and depend upon graphic designs rather than by
computations and rectangular coordinates. I've built several dead beat
movements and they are working well, but still looking for perfection. Any
words of wisdom will be happily received. Thanks, Dave Anderson

http://www.ubr.com/clocks/pub/airy/airy2a.html