Gyroscope and davy lamp: what they have in common

1. Step 1. Gyroscope — is part of — V-2 rocket. A gyroscopic guidance system.
2. Step 2. V-2 rocket — evolved into — R-7 rocket. The Soviet rocket programme began by studying the V-2 (the R-1 was its copy).
3. Step 3. R-7 rocket — is made of — Kerosene. The fuel is kerosene.
4. Step 4. Kerosene — is used in — Kerosene lamp. The fuel.
5. Step 5. Kerosene lamp — has part — Wick. A wick.
6. Step 6. Wick — is part of — Davy lamp. A wick.

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