Mouldboard and autoclave: what they have in common

1. Step 1. Mouldboard — is part of — Steel plough. It turns the furrow over.
2. Step 2. Steel plough — is used in — Tractor. Ploughing with a tractor.
3. Step 3. Tractor — evolved from — Watt steam engine. The first tractors were steam-powered.
4. Step 4. Watt steam engine — evolved from — Newcomen engine. Watt improved Newcomen’s engine.
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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