Hyperboloid structure and voltaic pile: what they have in common

1. Step 1. Hyperboloid structure — includes — Shukhov Tower. A hyperboloid tower.
2. Step 2. Shukhov Tower — has part — Antenna. A radio tower.
3. Step 3. Antenna — is part of — Radio. An antenna.
4. Step 4. Radio — includes — Transistor radio. A radio receiver.
5. Step 5. Transistor radio — has part — Dry cell. Batteries.
6. Step 6. Dry cell — evolved from — Voltaic pile. A convenient form of the galvanic cell.

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