Crane (ancient) and radio: what they have in common

1. Step 1. Crane (ancient) — has part — Block and tackle. The crane lifted loads with a block and tackle.
2. Step 2. Block and tackle — is part of — Drilling rig. The block and tackle lifts the drill string.
3. Step 3. Drilling rig — is part of — Offshore drilling platform. A drilling rig.
4. Step 4. Offshore drilling platform — uses — Archimedes’ principle. Floating platforms.
5. Step 5. Archimedes’ principle — is used in — Weather balloon. A balloon filled with hydrogen or helium.
6. Step 6. Weather balloon — has part — Radio. A radiosonde.

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