Coke and gyroscope: what they have in common

1. Step 1. Coke — is used in — Steel works. The steel works’ blast furnaces run on coke.
2. Step 2. Steel works — uses — Air separation. The basic oxygen process uses industrial oxygen.
3. Step 3. Air separation — is used in — Oxygen. Industrial oxygen.
4. Step 4. Oxygen — is material for — V-2 rocket. The oxidizer is liquid oxygen.
5. Step 5. V-2 rocket — has part — Gyroscope. A gyroscopic guidance system.

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