Overhead crane and voltaic pile: what they have in common

1. Step 1. Overhead crane — has part — Block and tackle. A block and tackle.
2. Step 2. Block and tackle — is part of — Drilling rig. The block and tackle lifts the drill string.
3. Step 3. Drilling rig — has part — Diesel engine. The drive.
4. Step 4. Diesel engine — is part of — Submarine. Diesel-electric submarines.
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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