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Elektročas HH3 – the most accurate pendulum clock on the planet
Most accurate pendulum clock on the planet. A project to lock a pendulum master clock to atomic clock.
The NPL caesium fountain primary frequency standard apparatus is used to realise the SI definition of the second and contributes to the construction of the international time scale, UTC. Many different methods for disciplining a pendulum oscillator exist, I can recommend an excellent book from Prof. Miroslav Hajn Základy jemné mechaniky a hodinářství(published in 1953). Should we assume the 0.1 sec/day specification, the clock would needed to be displaced vertically by not more than 3-4 storeys to obtain the required tuning range for PLL (phase locked loop) by working on the gravitational acceleration.
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