Kitchen scale e newcomen engine: o que têm em comum

1. Passo 1. Kitchen scale — tem como parte — Spring. The load stretches a spring.
2. Passo 2. Spring — faz parte de — Safety valve. A spring-loaded valve.
3. Passo 3. Safety valve — faz parte de — Pressure cooker. Papin invented the safety valve precisely for his digester.
4. Passo 4. Pressure cooker — inspirou — Newcomen engine. Papin’s experiments with steam and a piston preceded Newcomen’s engine.

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