Pneumatic pushers e voltaic pile: o que têm em comum

1. Passo 1. Pneumatic pushers — faz parte de — Player piano. They press the keys when signalled by holes.
2. Passo 2. Player piano — tem como parte — Fole. Pedal bellows create suction.
3. Passo 3. Fole — é feito de — Leather. Bellows are a leather bag.
4. Passo 4. Leather — é material para — Submarine. It was covered with leather.
5. Passo 5. Submarine — tem como parte — Lead–acid battery. Underwater, electric motors run on batteries.
6. Passo 6. Lead–acid battery — evoluiu de — Voltaic pile. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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