Counter register and cannon: what they have in common

1. Step 1. Counter register — is part of — Electricity meter. Gears count the revolutions of the disc.
2. Step 2. Electricity meter — has part — Permanent magnet. A braking magnet.
3. Step 3. Permanent magnet — is part of — Compass. The needle is a magnet.
4. Step 4. Compass — is part of — Caravel. A magnetic compass.
5. Step 5. Caravel — evolved into — Galleon. Larger and more heavily armed.
6. Step 6. Galleon — has part — Cannon. Cannons on the decks.

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