a narrow wheel geared to a striking train or other mechanism and having a notched rim engaging with another mechanism permitting it to rotate through a specific arc.
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How to use locking plate in a sentence
The chief forms are Rack, and Locking-plate, or Count-wheel.Time Telling through the Ages | Harry Chase Brearley
Wheel, CountThe wheel carrying the locking-plate in a striking mechanism.Time Telling through the Ages | Harry Chase Brearley
It strikes the hours, only, by the old count wheel or locking plate method.Time and Its Measurement | James Arthur