Pneumatic pushers and voltaic pile: what they have in common

1. Step 1. Pneumatic pushers — is part of — Player piano. They press the keys when signalled by holes.
2. Step 2. Player piano — has part — Bellows. Pedal bellows create suction.
3. Step 3. Bellows — is made of — Leather. Bellows are a leather bag.
4. Step 4. Leather — is material for — Submarine. It was covered with leather.
5. Step 5. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.
6. Step 6. Lead–acid battery — evolved from — Voltaic pile. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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