Barometer and multistage rocket: what they have in common

1. Step 1. Barometer — evolved into — Altimeter. An altimeter is a barometer with an altitude scale.
2. Step 2. Altimeter — is part of — Cockpit. An altimeter.
3. Step 3. Cockpit — has part — Attitude indicator. An attitude indicator.
4. Step 4. Attitude indicator — has part — Gyroscope. A gyroscope.
5. Step 5. Gyroscope — is part of — Intercontinental ballistic missile. Inertial navigation.
6. Step 6. Intercontinental ballistic missile — is a kind of — Multistage rocket. A multistage rocket.

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