Fire control predictor and windlass: what they have in common

1. Step 1. Fire control predictor — is part of — Anti-aircraft gun. It calculates the lead.
2. Step 2. Anti-aircraft gun — has part — Gun barrel. A long barrel.
3. Step 3. Gun barrel — is part of — Assault rifle. A rifled barrel.
4. Step 4. Assault rifle — has part — Spring. A return spring.
5. Step 5. Spring — is part of — Ratchet. The pawl spring.
6. Step 6. Ratchet — is part of — Windlass. A ratchet holds the load.

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