Ski lift and plough: what they have in common

1. Step 1. Ski lift — has part — Wire rope. A cable.
2. Step 2. Wire rope — is part of — Mine hoist. Mine ropes were the first use of wire rope.
3. Step 3. Mine hoist — has part — Watt steam engine. Steam winding engines.
4. Step 4. Watt steam engine — evolved into — Tractor. The first tractors were steam-powered.
5. Step 5. Tractor — uses — Steel plough. Ploughing with a tractor.
6. Step 6. Steel plough — evolved from — Plough. A steel share.

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