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Plot and , as , with .

Best fit to data (blue line). Reference gradient (red lines):-0.005seconds/deg C.
All other things equal, going should be proportional to rate of change of temperature because of thermal expansion of pendulum. This is difficult to observe unless the clock is running very steadily for several days and pressure and density remain steady.

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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)].