Ballast weights and autoclave: what they have in common

1. Step 1. Ballast weights — is part of — Diving bell. It sinks the bell.
2. Step 2. Diving bell — evolved into — Diving suit. Individual equipment.
3. Step 3. Diving suit — has part — Piston pump. Air was pumped from the surface.
4. Step 4. Piston pump — is part of — Newcomen engine. The beam drove a mine pump.
5. Step 5. Newcomen engine — was inspired by — Pressure cooker. Papin’s experiments with steam and a piston preceded Newcomen’s engine.
6. Step 6. Pressure cooker — works like — Autoclave. Papin’s digester was the prototype of the autoclave.

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