Spirit level bubble vial and radar: what they have in common

1. Step 1. Spirit level bubble vial — is part of — Spirit level. A vial with liquid and a bubble.
2. Step 2. Spirit level — uses — Universal gravitation. The bubble rises to the highest point.
3. Step 3. Universal gravitation — is used in — Mortar (weapon). The bomb flies on a steep trajectory.
4. Step 4. Mortar (weapon) — has part — Gun barrel. A smooth bore.
5. Step 5. Gun barrel — is part of — Anti-aircraft gun. A long barrel.
6. Step 6. Anti-aircraft gun — uses — Radar. Radar guidance.

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