Kitchen scale and newcomen engine: what they have in common

1. Step 1. Kitchen scale — has part — Spring. The load stretches a spring.
2. Step 2. Spring — is part of — Safety valve. A spring-loaded valve.
3. Step 3. Safety valve — is part of — Pressure cooker. Papin invented the safety valve precisely for his digester.
4. Step 4. Pressure cooker — inspired — Newcomen engine. Papin’s experiments with steam and a piston preceded Newcomen’s engine.

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