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30 Dec 2017 [23:20]
ADJUST: +1015ms/day to 32200 to account for the raising of the prism on the pendulum - and a top-up wind
30 Dec 2017 [22:02]
winding with Mark Irving and John Aldridge.
30 Dec 2017 [20:32]
Replaced twist laser unit with a sleeker version, and stopped pndulum to raise the prism into line with the new laser - does it work?

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Interval between data points: seconds [either 3 seconds (weather data is duplicated) or multiples of 60 seconds (all data is averaged)].

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Contact:, Trinity College, Cambridge