Rocket guidance unit and steam locomotive: what they have in common

1. Step 1. Rocket guidance unit — is part of — R-7 rocket. A gyroscopic guidance system.
2. Step 2. R-7 rocket — has part — Liquid-propellant rocket engine. RD-107 and RD-108 engines.
3. Step 3. Liquid-propellant rocket engine — has part — De Laval nozzle. A nozzle.
4. Step 4. De Laval nozzle — evolved from — Steam turbine. De Laval invented the nozzle for a steam turbine.
5. Step 5. Steam turbine — evolved from — Watt steam engine. The turbine replaced piston engines in large installations.
6. Step 6. Watt steam engine — is part of — Steam locomotive. A steam locomotive is driven by a steam engine.

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