Anchor shank and atomic clock: what they have in common

1. Step 1. Anchor shank — is part of — Anchor. A rod.
2. Step 2. Anchor — uses — Universal gravitation. Weight and grip on the seabed.
3. Step 3. Universal gravitation — is used in — Anchor escapement. The pace is set by a pendulum under gravity.
4. Step 4. Anchor escapement — is part of — Pendulum clock. An anchor escapement.
5. Step 5. Pendulum clock — evolved into — Quartz clock. Quartz replaced the pendulum as the frequency standard.
6. Step 6. Quartz clock — evolved into — Atomic clock. The quartz oscillator is tuned to an atomic standard.

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