| 21. | Both techniques used escapements, but these have only the name in common.
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| 22. | This electromagnet releases a gravity lever onto the escapement above the master pendulum.
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| 23. | A jeweled watch with a lever escapement should contain at least 7 jewels.
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| 24. | It was operated by an escapement mechanism and the earliest known chain drive.
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| 25. | They must be adjusted to precisely correct angles for the escapement to function.
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| 26. | The first thing to be improved was the escapement.
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| 27. | The clock was converted to pendulum and anchor escapement in the 17th century.
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| 28. | The weakest link of any mechanical timekeeper is the escapement's lubrication.
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| 29. | The escapement was assembled on its own adjustable platform.
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| 30. | Especially the escapement / gear, as that appears to need some precision.
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