The pendulum clock in
Trinity College, Cambridge was installed in 1910. It is remarkably accurate, known to be better than one second per month. In 2009 a system was installed to monitor the "going".
The work was done as part of a 4th year MEng project at the Engineering Department.
A sensor on the pendulum detects the going of the clock, which is compared to the accurate time signal from a GPS receiver.
For an entirely mechanical clock the accuracy is remarkable.
Watch the clock strike twelve or hear it strike twelve at
Singing from the Towers .
Follow @clockkeeper on twitter.
Today's and
yesterday's weather in Cambridge, including wind.
Here is a graph for the last 30 days of drift
A barometric compensator was installed at clock change - midnight 28 March 2010.
The clock is regulated as infrequently as possible so as to stay within +/- 5 seconds of the correct time.
This enables the steady-state physics of the clock to be examined without unnecessary interference.
The black dots • indicate that there is a comment relating to the time indicated.
Blue arrows pointing down ▼ indicate that an adjustment was made to the Going of the clock by removing weights from the pendulum.
Red arrows up ▲ indicate addition of weights to speed the clock up.