A tall mechanical clock, usually between six and seven and a half feet tall and built with a carved wooden frame and a detailed clock face at the top. Grandfather clocks are powered by a long pendulum and one or more weights on long chains, which take up most of the vertical space inside the clock. The weights serve the same purpose as the winding knob on a mechanical wristwatch, tightening the spring and providing resistance so that its constant tension can drive the timekeeping gears.

The long shape and wooden frame led to the rather morbid name "coffin clock" when these were first produced. The name that's currently used comes directly from the 1876 song "My Grandfather's Clock" by Henry Clay Work.

I stand here, cradling time in wrinkled arms
watching the family grow throughout the years
while I am ageless myself,
hard immortal chestnut,
brass dials,
and polished ivory standing still with every tick
and yet leaping forward
following the years' paths

As you grow up,
you will wonder about your ancestors,
and look up to me for guidance,
but I am silent, I offer no answers,
only the time

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