Airship and hollerith tabulator: what they have in common

1. Step 1. Airship — uses — Helium. After the Hindenburg — helium.
2. Step 2. Helium — is material for — Superconducting magnet. It is cooled with liquid helium.
3. Step 3. Superconducting magnet — is part of — Maglev. Japan’s SCMaglev uses superconducting magnets.
4. Step 4. Maglev — uses — Electromagnetism. Electromagnets hold and move the train.
5. Step 5. Electromagnetism — is used in — Hollerith tabulator. The counters click with electromagnets.

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