way a clock works is actually surprisingly simple:
Note - You can click on the images for larger versions
A weight hangs from pulley A which wants to spin it, but it is restricted to how fast it can turn by the escapement (in this case a flying pendulum) which is linked to this pulley via all the other gears.
i.e. if gear G is disconnected then all the other gears spin very fast until the weight hits the ground.
The escapement on this clock is set up so that it takes 20 seconds for gear G to make a full turn (i.e. one revolution), this is then geared through F, E, D and C so that it results in the bottom gear wheel of C turning once an hour - this is directly linked to the minute hand of the clock
Gears B and H are linked in such a way that it takes 12 revolutions of the hour hand to cause the final gear to turn one revolution (this is directly connected to the hour hand)
And that is all there is to it !
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