Oil pumpjack and computer: what they have in common

1. Step 1. Oil pumpjack — is part of — Oil well. It drives the sucker-rod pump.
2. Step 2. Oil well — is made of — Wrought iron. The casing pipes are iron.
3. Step 3. Wrought iron — is material for — Excavator. Otis’s steam shovel is iron.
4. Step 4. Excavator — has part — Hydraulic cylinder. Hydraulic cylinders move the boom and the bucket.
5. Step 5. Hydraulic cylinder — is part of — Flight simulator. A motion platform.
6. Step 6. Flight simulator — uses — Computer. Modern simulators are computer-based.

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