Steel frame and newcomen engine: what they have in common

1. Step 1. Steel frame — is part of — Skyscraper. A steel frame.
2. Step 2. Skyscraper — has part — Elevator. A skyscraper is impossible without a lift.
3. Step 3. Elevator — has part — Wire rope. The car hangs on cables.
4. Step 4. Wire rope — is part of — Mine hoist. Mine ropes were the first use of wire rope.
5. Step 5. Mine hoist — is part of — Coal mine. Hoisting.
6. Step 6. Coal mine — is used in — Newcomen engine. Pumping water out of mines.

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