Home > Terms > English, UK (UE) > Pendulum aperture

Pendulum aperture

A feature of the design of bracket-clock dials during the first half of the 18th century. A curved hole was cut in the dial above the centre to show the small engraved brass disc attached to the verge escapement arbour which moved from side to side as the clock was going.

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  • Part of Speech: noun
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  • Industry/Domain: Chronometry
  • Category: Clock
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