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Several important watch inventions - George Graham invented mercurial compensation pendulum and dead-beat escapement for clocks, John Harrison invented grid-iron compensation pendulum and George Graham invented the cylinder escapement. (1 gen 1720 anni – 1 gen 1750 anni)

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Maths - History of time

ByCharlotte Best
21 nov 2019
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Data:

1 gen 1720 anni
1 gen 1750 anni
~ 30 years
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