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19 Jan 2011 [11:27]
GLITCH power outage, this stopped the logging PC even though we have a UPS... Restarted at 12h45. I took the opportunity to install some proper weights for the fly (in brass 10.5 grams each, thanks to Mark Rainer for making these) so that it spins slower and impacts less on the escapement legs. This will help avoid reverse pigeon events. The amplitude dropped during the 4 minutes it took to install these.

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Trinity College, Cambridge 2014