Paddle steamer and radio: what they have in common

1. Step 1. Paddle steamer — evolved into — Screw steamship. The propeller proved more efficient than paddle wheels.
2. Step 2. Screw steamship — has part — Propeller. A propeller.
3. Step 3. Propeller — is part of — Airship. Air propellers.
4. Step 4. Airship — uses — Hydrogen. Zeppelins were filled with hydrogen.
5. Step 5. Hydrogen — is material for — Weather balloon. Filled with hydrogen or helium.
6. Step 6. Weather balloon — has part — Radio. A radiosonde.

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