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19 May 2009 [15:44]
Another curiosity is that small changes of Going vs Amplitude [link] shows a positive slope - not sure why. And there seem to be clusters - as if behaviour changes quickly and sits still for a while. The normal physics of a pendulum [link] predicts a negative slope, as here [link] so there is something more subtle going on. Maybe the spider again?
19 May 2009 [14:58]
Just a general remark, it has been noticeable over the last few days that pendulum amplitude forms a nice linear relationship with air density. This fits perfectly with a 0.5*rho*V^2 drag law. see [link]
19 May 2009 [12:05]
clock wound at 1.05pm - note the small glitch in amplitude, perhaps opening the clock case causes air currents that causing a small change in pendulum motion. Or maybe the act of winding moves the clock bed slightly causing the pendulum to be disturbed.

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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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Trinity College, Cambridge 2014