Nuclear magnetic resonance and windlass: what they have in common

1. Step 1. Nuclear magnetic resonance — uses — Electromagnetic waves. Radio pulses.
2. Step 2. Electromagnetic waves — evolved from — Electromagnetic induction. Maxwell’s equations, which generalized induction, predicted electromagnetic waves.
3. Step 3. Electromagnetic induction — is used in — RFID. The tag gets energy from the reader’s field.
4. Step 4. RFID — is used in — Turnstile. Contactless cards.
5. Step 5. Turnstile — has part — Ratchet. A ratchet.
6. Step 6. Ratchet — is part of — Windlass. A ratchet holds the load.

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