Manometer e needle: o que têm em comum

1. Passo 1. Manometer — faz parte de — Caldeira. The gauge on a boiler shows the steam pressure — without it the boiler could explode.
2. Passo 2. Caldeira — faz parte de — Steam hammer. A boiler supplies the steam.
3. Passo 3. Steam hammer — evoluiu de — Hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
4. Passo 4. Hammer — evoluiu de — Stone tool. The first hammer was a stone in the hand.
5. Passo 5. Stone tool — evoluiu para — Needle. Bone needles with an eye are part of the Palaeolithic toolkit.

Abrir Evothings