Tower clock movement and micrometer: what they have in common

1. Step 1. Tower clock movement — is part of — Tower clock. A wheel train with weights.
2. Step 2. Tower clock — has part — Escapement. An escapement sets the pace.
3. Step 3. Escapement — uses — Universal gravitation. The pace of the clock is set by a falling weight.
4. Step 4. Universal gravitation — is used in — Anchor. Weight and grip on the seabed.
5. Step 5. Anchor — has part — Shackle. The chain mount.
6. Step 6. Shackle — is part of — Micrometer. A rigid frame.

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