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26 Mar 2011 [22:30]
GLITCH Advanced clock for summer time (effected by Mark Rainer and Graham {clocky} Newman). The 30ms shift in drift is due to the removal of the mass of the gravity arms from the pendulum - same effect as removing mass from the regulation tray causes the clock to run slower. For about 3 minutes it ran about 4s/day slow. Note also the 1.2mrad drop in pendulum amplitude and the recovery afterwards.

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