Ironclad and programmable logic controller: what they have in common

1. Step 1. Ironclad — has part — Gyrocompass. Steel ships distort a magnetic compass.
2. Step 2. Gyrocompass — evolved from — Compass. A compass without a magnet.
3. Step 3. Compass — works like — Hall sensor. Both sense the Earth’s magnetic field.
4. Step 4. Hall sensor — is part of — Anti-lock braking system (ABS). Sensors measure the wheel speed.
5. Step 5. Anti-lock braking system (ABS) — has part — Microprocessor. A control unit.
6. Step 6. Microprocessor — is part of — Programmable logic controller. A processor.

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