Air separation and shaduf: what they have in common

1. Step 1. Air separation — is used in — Steel works. The basic oxygen process uses industrial oxygen.
2. Step 2. Steel works — has part — Overhead crane. Overhead cranes.
3. Step 3. Overhead crane — has part — Block and tackle. A block and tackle.
4. Step 4. Block and tackle — is part of — Tower crane. The load is lifted with a block and tackle.
5. Step 5. Tower crane — uses — Counterweight. A counterweight balances the jib.
6. Step 6. Counterweight — is used in — Shaduf. The counterweight makes lifting the bucket easier.

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