Cruise control and aerosol can: what they have in common

1. Step 1. Cruise control — evolved from — Centrifugal governor. Early systems were a development of the centrifugal governor.
2. Step 2. Centrifugal governor — is part of — Watt steam engine. Watt used a centrifugal governor to keep the speed steady.
3. Step 3. Watt steam engine — has part — Valve. A slide valve distributes the steam.
4. Step 4. Valve — is part of — Aerosol can. A valve.

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