Hammer head and heron’s aeolipile: what they have in common

1. Step 1. Hammer head — is part of — Hammer. The striking part.
2. Step 2. Hammer — evolved into — Trip hammer. A trip hammer is a hammer lifted and dropped by a water wheel.
3. Step 3. Trip hammer — has part — Water wheel. The shaft was turned by a water wheel.
4. Step 4. Water wheel — evolved into — Turbine. The water turbine evolved from the water wheel.
5. Step 5. Turbine — evolved from — Heron’s aeolipile. The aeolipile is the oldest ancestor of the steam turbine.

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