Tracker bar and turbine: what they have in common

1. Step 1. Tracker bar — is part of — Player piano. Holes let air through to the valves.
2. Step 2. Player piano — has part — Bellows. Pedal bellows create suction.
3. Step 3. Bellows — is part of — Forge. Bellows fan the fire of the forge.
4. Step 4. Forge — uses — Combustion. Metal is heated in the flame.
5. Step 5. Combustion — is used in — Heron’s aeolipile. A fire boils the water in the cauldron.
6. Step 6. Heron’s aeolipile — evolved into — Turbine. The aeolipile is the oldest ancestor of the steam turbine.

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