Micrometer thimble with scale and electric motor: what they have in common

1. Step 1. Micrometer thimble with scale — is part of — Micrometer. Hundredths of a millimetre.
2. Step 2. Micrometer — has part — Shackle. A rigid frame.
3. Step 3. Shackle — is part of — Anchor. The chain mount.
4. Step 4. Anchor — is used in — Anchor windlass. It raises the anchor.
5. Step 5. Anchor windlass — has part — Electric motor. The drive (formerly by hand).

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