driving clock

driving clock
noun
1. : a mechanism for turning an equatorial telescope or a coelostat around its polar axis at the proper rate to keep a celestial body in the field of view
2. : a driving mechanism for a chronograph or other recording mechanism

* * *

driving clock,
a clock used to drive an apparatus at a rate which is proportional to the passage of time. A driving clock attached to an equatorial telescope directs it continuously towards the same point in the sky.

Useful english dictionary. 2012.

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