Quadcopter (drone) and watt steam engine: what they have in common

1. Step 1. Quadcopter (drone) — uses — Feedback control. The flight controller holds the position.
2. Step 2. Feedback control — is used in — Centrifugal governor. The governor is a classic example of feedback.
3. Step 3. Centrifugal governor — is part of — Watt steam engine. Watt used a centrifugal governor to keep the speed steady.

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