Glass tube and internal combustion engine: what they have in common

1. Step 1. Glass tube — is part of — Barometer. A tube sealed at the top.
2. Step 2. Barometer — evolved into — Altimeter. An altimeter is a barometer with an altitude scale.
3. Step 3. Altimeter — is part of — Cockpit. An altimeter.
4. Step 4. Cockpit — is part of — Aeroplane. A cockpit.
5. Step 5. Aeroplane — has part — Internal combustion engine. Piston aero engines.

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