I look after a pendulum clock at the University of Cambridge
which I hope will achieve an accuracy of less than 1 second of error
per year (www.trin.cam.ac.uk/clock).
It has a temperature-compensated pendulum, but is sensitive to air
pressure variation.
If the mean global temperature was to rise by, say,
4 °C, would there be any change to mean air pressure at sea level? Put
simply, would global warming cause the clock to speed up or slow down?
Hugh Hunt, Keeper of the Clock, Trinity College, University of Cambridge, UK
