How do analog clocks/watches tick at exactly a second?
In: 6
Both use some physical process that takes a calculated/known period of time.
For a clock, it was how long a weight on a pole called a pendulum takes to swing.
The weight would swing from one side, then back. Gravity isn’t changing enough to matter so it will take the same time each swing.
When the pendulum was at the top, it would let a gear move one gear tooth (this is the tick sound). They’d also boost the pendulum up a bit, because otherwise it would stop swinging after a long time.
For watch, they have a spring coiling and uncoiling instead of a pendulum, but otherwise worked the same way.
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