Vacuum tube and watt steam engine: what they have in common

1. Step 1. Vacuum tube — is part of — Operational amplifier. The first op-amps used vacuum tubes.
2. Step 2. Operational amplifier — uses — Feedback control. Feedback sets the gain.
3. Step 3. Feedback control — is used in — Centrifugal governor. The governor is a classic example of feedback.
4. Step 4. Centrifugal governor — is part of — Watt steam engine. Watt used a centrifugal governor to keep the speed steady.

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