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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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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 ene 1720 año – 1 ene 1750 año)

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Maths - History of time

ByCharlotte Best
21 nov 2019
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1 ene 1720 año
1 ene 1750 año
~ 30 years
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