Gyrocompass and plough: what they have in common

1. Step 1. Gyrocompass — is part of — Ironclad. Steel ships distort a magnetic compass.
2. Step 2. Ironclad — has part — Watt steam engine. Steam engines.
3. Step 3. Watt steam engine — evolved into — Tractor. The first tractors were steam-powered.
4. Step 4. Tractor — uses — Steel plough. Ploughing with a tractor.
5. Step 5. Steel plough — evolved from — Plough. A steel share.

Open Evothings