Bell clapper and boiler: what they have in common

1. Step 1. Bell clapper — is part of — Bell. A clapper that strikes from inside.
2. Step 2. Bell — is part of — Diving bell. A body open at the bottom.
3. Step 3. Diving bell — evolved into — Diving suit. Individual equipment.
4. Step 4. Diving suit — has part — Piston pump. Air was pumped from the surface.
5. Step 5. Piston pump — is part of — Newcomen engine. The beam drove a mine pump.
6. Step 6. Newcomen engine — has part — Boiler. Steam from the boiler.

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